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/*! @name mux.js @version 5.10.0 @license Apache-2.0 */
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(function (global, factory) {
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typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
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typeof define === 'function' && define.amd ? define(factory) :
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(global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.muxjs = factory());
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}(this, (function () { 'use strict';
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/**
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* mux.js
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*
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* Copyright (c) Brightcove
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* Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
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*
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* An object that stores the bytes of an FLV tag and methods for
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* querying and manipulating that data.
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* @see http://download.macromedia.com/f4v/video_file_format_spec_v10_1.pdf
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*/
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var _FlvTag; // (type:uint, extraData:Boolean = false) extends ByteArray
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_FlvTag = function FlvTag(type, extraData) {
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var // Counter if this is a metadata tag, nal start marker if this is a video
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// tag. unused if this is an audio tag
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adHoc = 0,
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// :uint
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// The default size is 16kb but this is not enough to hold iframe
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// data and the resizing algorithm costs a bit so we create a larger
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// starting buffer for video tags
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bufferStartSize = 16384,
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// checks whether the FLV tag has enough capacity to accept the proposed
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// write and re-allocates the internal buffers if necessary
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prepareWrite = function prepareWrite(flv, count) {
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var bytes,
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minLength = flv.position + count;
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if (minLength < flv.bytes.byteLength) {
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// there's enough capacity so do nothing
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return;
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} // allocate a new buffer and copy over the data that will not be modified
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bytes = new Uint8Array(minLength * 2);
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bytes.set(flv.bytes.subarray(0, flv.position), 0);
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flv.bytes = bytes;
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flv.view = new DataView(flv.bytes.buffer);
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},
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// commonly used metadata properties
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widthBytes = _FlvTag.widthBytes || new Uint8Array('width'.length),
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heightBytes = _FlvTag.heightBytes || new Uint8Array('height'.length),
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videocodecidBytes = _FlvTag.videocodecidBytes || new Uint8Array('videocodecid'.length),
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i;
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if (!_FlvTag.widthBytes) {
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// calculating the bytes of common metadata names ahead of time makes the
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// corresponding writes faster because we don't have to loop over the
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// characters
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// re-test with test/perf.html if you're planning on changing this
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for (i = 0; i < 'width'.length; i++) {
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widthBytes[i] = 'width'.charCodeAt(i);
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}
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for (i = 0; i < 'height'.length; i++) {
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heightBytes[i] = 'height'.charCodeAt(i);
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}
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for (i = 0; i < 'videocodecid'.length; i++) {
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videocodecidBytes[i] = 'videocodecid'.charCodeAt(i);
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}
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_FlvTag.widthBytes = widthBytes;
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_FlvTag.heightBytes = heightBytes;
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_FlvTag.videocodecidBytes = videocodecidBytes;
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}
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this.keyFrame = false; // :Boolean
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switch (type) {
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case _FlvTag.VIDEO_TAG:
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this.length = 16; // Start the buffer at 256k
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bufferStartSize *= 6;
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break;
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case _FlvTag.AUDIO_TAG:
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this.length = 13;
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this.keyFrame = true;
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break;
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case _FlvTag.METADATA_TAG:
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this.length = 29;
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this.keyFrame = true;
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break;
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default:
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throw new Error('Unknown FLV tag type');
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}
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this.bytes = new Uint8Array(bufferStartSize);
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this.view = new DataView(this.bytes.buffer);
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this.bytes[0] = type;
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this.position = this.length;
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this.keyFrame = extraData; // Defaults to false
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// presentation timestamp
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this.pts = 0; // decoder timestamp
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this.dts = 0; // ByteArray#writeBytes(bytes:ByteArray, offset:uint = 0, length:uint = 0)
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this.writeBytes = function (bytes, offset, length) {
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var start = offset || 0,
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end;
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length = length || bytes.byteLength;
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end = start + length;
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prepareWrite(this, length);
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this.bytes.set(bytes.subarray(start, end), this.position);
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this.position += length;
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this.length = Math.max(this.length, this.position);
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}; // ByteArray#writeByte(value:int):void
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this.writeByte = function (byte) {
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prepareWrite(this, 1);
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this.bytes[this.position] = byte;
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this.position++;
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this.length = Math.max(this.length, this.position);
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}; // ByteArray#writeShort(value:int):void
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this.writeShort = function (short) {
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prepareWrite(this, 2);
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this.view.setUint16(this.position, short);
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this.position += 2;
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this.length = Math.max(this.length, this.position);
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}; // Negative index into array
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// (pos:uint):int
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this.negIndex = function (pos) {
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return this.bytes[this.length - pos];
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}; // The functions below ONLY work when this[0] == VIDEO_TAG.
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// We are not going to check for that because we dont want the overhead
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// (nal:ByteArray = null):int
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this.nalUnitSize = function () {
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if (adHoc === 0) {
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return 0;
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}
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return this.length - (adHoc + 4);
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};
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this.startNalUnit = function () {
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// remember position and add 4 bytes
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if (adHoc > 0) {
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throw new Error('Attempted to create new NAL wihout closing the old one');
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} // reserve 4 bytes for nal unit size
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adHoc = this.length;
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this.length += 4;
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this.position = this.length;
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}; // (nal:ByteArray = null):void
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this.endNalUnit = function (nalContainer) {
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var nalStart, // :uint
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nalLength; // :uint
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// Rewind to the marker and write the size
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if (this.length === adHoc + 4) {
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// we started a nal unit, but didnt write one, so roll back the 4 byte size value
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this.length -= 4;
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} else if (adHoc > 0) {
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nalStart = adHoc + 4;
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nalLength = this.length - nalStart;
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this.position = adHoc;
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this.view.setUint32(this.position, nalLength);
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this.position = this.length;
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if (nalContainer) {
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// Add the tag to the NAL unit
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nalContainer.push(this.bytes.subarray(nalStart, nalStart + nalLength));
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}
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}
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adHoc = 0;
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};
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/**
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* Write out a 64-bit floating point valued metadata property. This method is
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* called frequently during a typical parse and needs to be fast.
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*/
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// (key:String, val:Number):void
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this.writeMetaDataDouble = function (key, val) {
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var i;
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prepareWrite(this, 2 + key.length + 9); // write size of property name
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this.view.setUint16(this.position, key.length);
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this.position += 2; // this next part looks terrible but it improves parser throughput by
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// 10kB/s in my testing
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// write property name
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if (key === 'width') {
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this.bytes.set(widthBytes, this.position);
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this.position += 5;
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} else if (key === 'height') {
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this.bytes.set(heightBytes, this.position);
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this.position += 6;
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} else if (key === 'videocodecid') {
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this.bytes.set(videocodecidBytes, this.position);
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this.position += 12;
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} else {
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for (i = 0; i < key.length; i++) {
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this.bytes[this.position] = key.charCodeAt(i);
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this.position++;
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}
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} // skip null byte
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this.position++; // write property value
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this.view.setFloat64(this.position, val);
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this.position += 8; // update flv tag length
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this.length = Math.max(this.length, this.position);
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++adHoc;
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}; // (key:String, val:Boolean):void
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this.writeMetaDataBoolean = function (key, val) {
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var i;
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prepareWrite(this, 2);
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this.view.setUint16(this.position, key.length);
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this.position += 2;
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for (i = 0; i < key.length; i++) {
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// if key.charCodeAt(i) >= 255, handle error
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prepareWrite(this, 1);
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this.bytes[this.position] = key.charCodeAt(i);
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this.position++;
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}
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prepareWrite(this, 2);
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this.view.setUint8(this.position, 0x01);
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this.position++;
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this.view.setUint8(this.position, val ? 0x01 : 0x00);
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this.position++;
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this.length = Math.max(this.length, this.position);
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++adHoc;
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}; // ():ByteArray
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this.finalize = function () {
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var dtsDelta, // :int
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len; // :int
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switch (this.bytes[0]) {
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// Video Data
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case _FlvTag.VIDEO_TAG:
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// We only support AVC, 1 = key frame (for AVC, a seekable
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// frame), 2 = inter frame (for AVC, a non-seekable frame)
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this.bytes[11] = (this.keyFrame || extraData ? 0x10 : 0x20) | 0x07;
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this.bytes[12] = extraData ? 0x00 : 0x01;
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dtsDelta = this.pts - this.dts;
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this.bytes[13] = (dtsDelta & 0x00FF0000) >>> 16;
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this.bytes[14] = (dtsDelta & 0x0000FF00) >>> 8;
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this.bytes[15] = (dtsDelta & 0x000000FF) >>> 0;
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break;
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case _FlvTag.AUDIO_TAG:
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this.bytes[11] = 0xAF; // 44 kHz, 16-bit stereo
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this.bytes[12] = extraData ? 0x00 : 0x01;
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break;
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case _FlvTag.METADATA_TAG:
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this.position = 11;
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this.view.setUint8(this.position, 0x02); // String type
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this.position++;
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this.view.setUint16(this.position, 0x0A); // 10 Bytes
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this.position += 2; // set "onMetaData"
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this.bytes.set([0x6f, 0x6e, 0x4d, 0x65, 0x74, 0x61, 0x44, 0x61, 0x74, 0x61], this.position);
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this.position += 10;
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this.bytes[this.position] = 0x08; // Array type
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this.position++;
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this.view.setUint32(this.position, adHoc);
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this.position = this.length;
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this.bytes.set([0, 0, 9], this.position);
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this.position += 3; // End Data Tag
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this.length = this.position;
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break;
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}
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len = this.length - 11; // write the DataSize field
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this.bytes[1] = (len & 0x00FF0000) >>> 16;
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this.bytes[2] = (len & 0x0000FF00) >>> 8;
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this.bytes[3] = (len & 0x000000FF) >>> 0; // write the Timestamp
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this.bytes[4] = (this.dts & 0x00FF0000) >>> 16;
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this.bytes[5] = (this.dts & 0x0000FF00) >>> 8;
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this.bytes[6] = (this.dts & 0x000000FF) >>> 0;
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this.bytes[7] = (this.dts & 0xFF000000) >>> 24; // write the StreamID
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this.bytes[8] = 0;
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this.bytes[9] = 0;
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this.bytes[10] = 0; // Sometimes we're at the end of the view and have one slot to write a
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// uint32, so, prepareWrite of count 4, since, view is uint8
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prepareWrite(this, 4);
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this.view.setUint32(this.length, this.length);
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this.length += 4;
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this.position += 4; // trim down the byte buffer to what is actually being used
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this.bytes = this.bytes.subarray(0, this.length);
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this.frameTime = _FlvTag.frameTime(this.bytes); // if bytes.bytelength isn't equal to this.length, handle error
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return this;
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};
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};
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_FlvTag.AUDIO_TAG = 0x08; // == 8, :uint
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_FlvTag.VIDEO_TAG = 0x09; // == 9, :uint
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_FlvTag.METADATA_TAG = 0x12; // == 18, :uint
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// (tag:ByteArray):Boolean {
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_FlvTag.isAudioFrame = function (tag) {
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return _FlvTag.AUDIO_TAG === tag[0];
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}; // (tag:ByteArray):Boolean {
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_FlvTag.isVideoFrame = function (tag) {
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return _FlvTag.VIDEO_TAG === tag[0];
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}; // (tag:ByteArray):Boolean {
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_FlvTag.isMetaData = function (tag) {
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return _FlvTag.METADATA_TAG === tag[0];
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}; // (tag:ByteArray):Boolean {
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_FlvTag.isKeyFrame = function (tag) {
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if (_FlvTag.isVideoFrame(tag)) {
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return tag[11] === 0x17;
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}
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if (_FlvTag.isAudioFrame(tag)) {
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return true;
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}
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if (_FlvTag.isMetaData(tag)) {
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return true;
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}
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return false;
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}; // (tag:ByteArray):uint {
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_FlvTag.frameTime = function (tag) {
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var pts = tag[4] << 16; // :uint
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pts |= tag[5] << 8;
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pts |= tag[6] << 0;
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pts |= tag[7] << 24;
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return pts;
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};
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var flvTag = _FlvTag;
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/**
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* mux.js
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*
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* Copyright (c) Brightcove
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* Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
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*
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* A lightweight readable stream implemention that handles event dispatching.
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* Objects that inherit from streams should call init in their constructors.
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*/
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var Stream = function Stream() {
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this.init = function () {
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var listeners = {};
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/**
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* Add a listener for a specified event type.
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* @param type {string} the event name
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* @param listener {function} the callback to be invoked when an event of
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* the specified type occurs
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*/
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this.on = function (type, listener) {
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if (!listeners[type]) {
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listeners[type] = [];
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}
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listeners[type] = listeners[type].concat(listener);
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};
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/**
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* Remove a listener for a specified event type.
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* @param type {string} the event name
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* @param listener {function} a function previously registered for this
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* type of event through `on`
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*/
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this.off = function (type, listener) {
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var index;
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if (!listeners[type]) {
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return false;
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}
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index = listeners[type].indexOf(listener);
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listeners[type] = listeners[type].slice();
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listeners[type].splice(index, 1);
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return index > -1;
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};
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/**
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* Trigger an event of the specified type on this stream. Any additional
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* arguments to this function are passed as parameters to event listeners.
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* @param type {string} the event name
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*/
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this.trigger = function (type) {
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var callbacks, i, length, args;
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|
callbacks = listeners[type];
|
|
|
|
|
|
if (!callbacks) {
|
|
|
return;
|
|
|
} // Slicing the arguments on every invocation of this method
|
|
|
// can add a significant amount of overhead. Avoid the
|
|
|
// intermediate object creation for the common case of a
|
|
|
// single callback argument
|
|
|
|
|
|
|
|
|
if (arguments.length === 2) {
|
|
|
length = callbacks.length;
|
|
|
|
|
|
for (i = 0; i < length; ++i) {
|
|
|
callbacks[i].call(this, arguments[1]);
|
|
|
}
|
|
|
} else {
|
|
|
args = [];
|
|
|
i = arguments.length;
|
|
|
|
|
|
for (i = 1; i < arguments.length; ++i) {
|
|
|
args.push(arguments[i]);
|
|
|
}
|
|
|
|
|
|
length = callbacks.length;
|
|
|
|
|
|
for (i = 0; i < length; ++i) {
|
|
|
callbacks[i].apply(this, args);
|
|
|
}
|
|
|
}
|
|
|
};
|
|
|
/**
|
|
|
* Destroys the stream and cleans up.
|
|
|
*/
|
|
|
|
|
|
|
|
|
this.dispose = function () {
|
|
|
listeners = {};
|
|
|
};
|
|
|
};
|
|
|
};
|
|
|
/**
|
|
|
* Forwards all `data` events on this stream to the destination stream. The
|
|
|
* destination stream should provide a method `push` to receive the data
|
|
|
* events as they arrive.
|
|
|
* @param destination {stream} the stream that will receive all `data` events
|
|
|
* @param autoFlush {boolean} if false, we will not call `flush` on the destination
|
|
|
* when the current stream emits a 'done' event
|
|
|
* @see http://nodejs.org/api/stream.html#stream_readable_pipe_destination_options
|
|
|
*/
|
|
|
|
|
|
|
|
|
Stream.prototype.pipe = function (destination) {
|
|
|
this.on('data', function (data) {
|
|
|
destination.push(data);
|
|
|
});
|
|
|
this.on('done', function (flushSource) {
|
|
|
destination.flush(flushSource);
|
|
|
});
|
|
|
this.on('partialdone', function (flushSource) {
|
|
|
destination.partialFlush(flushSource);
|
|
|
});
|
|
|
this.on('endedtimeline', function (flushSource) {
|
|
|
destination.endTimeline(flushSource);
|
|
|
});
|
|
|
this.on('reset', function (flushSource) {
|
|
|
destination.reset(flushSource);
|
|
|
});
|
|
|
return destination;
|
|
|
}; // Default stream functions that are expected to be overridden to perform
|
|
|
// actual work. These are provided by the prototype as a sort of no-op
|
|
|
// implementation so that we don't have to check for their existence in the
|
|
|
// `pipe` function above.
|
|
|
|
|
|
|
|
|
Stream.prototype.push = function (data) {
|
|
|
this.trigger('data', data);
|
|
|
};
|
|
|
|
|
|
Stream.prototype.flush = function (flushSource) {
|
|
|
this.trigger('done', flushSource);
|
|
|
};
|
|
|
|
|
|
Stream.prototype.partialFlush = function (flushSource) {
|
|
|
this.trigger('partialdone', flushSource);
|
|
|
};
|
|
|
|
|
|
Stream.prototype.endTimeline = function (flushSource) {
|
|
|
this.trigger('endedtimeline', flushSource);
|
|
|
};
|
|
|
|
|
|
Stream.prototype.reset = function (flushSource) {
|
|
|
this.trigger('reset', flushSource);
|
|
|
};
|
|
|
|
|
|
var stream = Stream;
|
|
|
|
|
|
/**
|
|
|
* mux.js
|
|
|
*
|
|
|
* Copyright (c) Brightcove
|
|
|
* Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
|
|
|
*
|
|
|
* Reads in-band caption information from a video elementary
|
|
|
* stream. Captions must follow the CEA-708 standard for injection
|
|
|
* into an MPEG-2 transport streams.
|
|
|
* @see https://en.wikipedia.org/wiki/CEA-708
|
|
|
* @see https://www.gpo.gov/fdsys/pkg/CFR-2007-title47-vol1/pdf/CFR-2007-title47-vol1-sec15-119.pdf
|
|
|
*/
|
|
|
// payload type field to indicate how they are to be
|
|
|
// interpreted. CEAS-708 caption content is always transmitted with
|
|
|
// payload type 0x04.
|
|
|
|
|
|
var USER_DATA_REGISTERED_ITU_T_T35 = 4,
|
|
|
RBSP_TRAILING_BITS = 128;
|
|
|
/**
|
|
|
* Parse a supplemental enhancement information (SEI) NAL unit.
|
|
|
* Stops parsing once a message of type ITU T T35 has been found.
|
|
|
*
|
|
|
* @param bytes {Uint8Array} the bytes of a SEI NAL unit
|
|
|
* @return {object} the parsed SEI payload
|
|
|
* @see Rec. ITU-T H.264, 7.3.2.3.1
|
|
|
*/
|
|
|
|
|
|
var parseSei = function parseSei(bytes) {
|
|
|
var i = 0,
|
|
|
result = {
|
|
|
payloadType: -1,
|
|
|
payloadSize: 0
|
|
|
},
|
|
|
payloadType = 0,
|
|
|
payloadSize = 0; // go through the sei_rbsp parsing each each individual sei_message
|
|
|
|
|
|
while (i < bytes.byteLength) {
|
|
|
// stop once we have hit the end of the sei_rbsp
|
|
|
if (bytes[i] === RBSP_TRAILING_BITS) {
|
|
|
break;
|
|
|
} // Parse payload type
|
|
|
|
|
|
|
|
|
while (bytes[i] === 0xFF) {
|
|
|
payloadType += 255;
|
|
|
i++;
|
|
|
}
|
|
|
|
|
|
payloadType += bytes[i++]; // Parse payload size
|
|
|
|
|
|
while (bytes[i] === 0xFF) {
|
|
|
payloadSize += 255;
|
|
|
i++;
|
|
|
}
|
|
|
|
|
|
payloadSize += bytes[i++]; // this sei_message is a 608/708 caption so save it and break
|
|
|
// there can only ever be one caption message in a frame's sei
|
|
|
|
|
|
if (!result.payload && payloadType === USER_DATA_REGISTERED_ITU_T_T35) {
|
|
|
var userIdentifier = String.fromCharCode(bytes[i + 3], bytes[i + 4], bytes[i + 5], bytes[i + 6]);
|
|
|
|
|
|
if (userIdentifier === 'GA94') {
|
|
|
result.payloadType = payloadType;
|
|
|
result.payloadSize = payloadSize;
|
|
|
result.payload = bytes.subarray(i, i + payloadSize);
|
|
|
break;
|
|
|
} else {
|
|
|
result.payload = void 0;
|
|
|
}
|
|
|
} // skip the payload and parse the next message
|
|
|
|
|
|
|
|
|
i += payloadSize;
|
|
|
payloadType = 0;
|
|
|
payloadSize = 0;
|
|
|
}
|
|
|
|
|
|
return result;
|
|
|
}; // see ANSI/SCTE 128-1 (2013), section 8.1
|
|
|
|
|
|
|
|
|
var parseUserData = function parseUserData(sei) {
|
|
|
// itu_t_t35_contry_code must be 181 (United States) for
|
|
|
// captions
|
|
|
if (sei.payload[0] !== 181) {
|
|
|
return null;
|
|
|
} // itu_t_t35_provider_code should be 49 (ATSC) for captions
|
|
|
|
|
|
|
|
|
if ((sei.payload[1] << 8 | sei.payload[2]) !== 49) {
|
|
|
return null;
|
|
|
} // the user_identifier should be "GA94" to indicate ATSC1 data
|
|
|
|
|
|
|
|
|
if (String.fromCharCode(sei.payload[3], sei.payload[4], sei.payload[5], sei.payload[6]) !== 'GA94') {
|
|
|
return null;
|
|
|
} // finally, user_data_type_code should be 0x03 for caption data
|
|
|
|
|
|
|
|
|
if (sei.payload[7] !== 0x03) {
|
|
|
return null;
|
|
|
} // return the user_data_type_structure and strip the trailing
|
|
|
// marker bits
|
|
|
|
|
|
|
|
|
return sei.payload.subarray(8, sei.payload.length - 1);
|
|
|
}; // see CEA-708-D, section 4.4
|
|
|
|
|
|
|
|
|
var parseCaptionPackets = function parseCaptionPackets(pts, userData) {
|
|
|
var results = [],
|
|
|
i,
|
|
|
count,
|
|
|
offset,
|
|
|
data; // if this is just filler, return immediately
|
|
|
|
|
|
if (!(userData[0] & 0x40)) {
|
|
|
return results;
|
|
|
} // parse out the cc_data_1 and cc_data_2 fields
|
|
|
|
|
|
|
|
|
count = userData[0] & 0x1f;
|
|
|
|
|
|
for (i = 0; i < count; i++) {
|
|
|
offset = i * 3;
|
|
|
data = {
|
|
|
type: userData[offset + 2] & 0x03,
|
|
|
pts: pts
|
|
|
}; // capture cc data when cc_valid is 1
|
|
|
|
|
|
if (userData[offset + 2] & 0x04) {
|
|
|
data.ccData = userData[offset + 3] << 8 | userData[offset + 4];
|
|
|
results.push(data);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
return results;
|
|
|
};
|
|
|
|
|
|
var discardEmulationPreventionBytes = function discardEmulationPreventionBytes(data) {
|
|
|
var length = data.byteLength,
|
|
|
emulationPreventionBytesPositions = [],
|
|
|
i = 1,
|
|
|
newLength,
|
|
|
newData; // Find all `Emulation Prevention Bytes`
|
|
|
|
|
|
while (i < length - 2) {
|
|
|
if (data[i] === 0 && data[i + 1] === 0 && data[i + 2] === 0x03) {
|
|
|
emulationPreventionBytesPositions.push(i + 2);
|
|
|
i += 2;
|
|
|
} else {
|
|
|
i++;
|
|
|
}
|
|
|
} // If no Emulation Prevention Bytes were found just return the original
|
|
|
// array
|
|
|
|
|
|
|
|
|
if (emulationPreventionBytesPositions.length === 0) {
|
|
|
return data;
|
|
|
} // Create a new array to hold the NAL unit data
|
|
|
|
|
|
|
|
|
newLength = length - emulationPreventionBytesPositions.length;
|
|
|
newData = new Uint8Array(newLength);
|
|
|
var sourceIndex = 0;
|
|
|
|
|
|
for (i = 0; i < newLength; sourceIndex++, i++) {
|
|
|
if (sourceIndex === emulationPreventionBytesPositions[0]) {
|
|
|
// Skip this byte
|
|
|
sourceIndex++; // Remove this position index
|
|
|
|
|
|
emulationPreventionBytesPositions.shift();
|
|
|
}
|
|
|
|
|
|
newData[i] = data[sourceIndex];
|
|
|
}
|
|
|
|
|
|
return newData;
|
|
|
}; // exports
|
|
|
|
|
|
|
|
|
var captionPacketParser = {
|
|
|
parseSei: parseSei,
|
|
|
parseUserData: parseUserData,
|
|
|
parseCaptionPackets: parseCaptionPackets,
|
|
|
discardEmulationPreventionBytes: discardEmulationPreventionBytes,
|
|
|
USER_DATA_REGISTERED_ITU_T_T35: USER_DATA_REGISTERED_ITU_T_T35
|
|
|
};
|
|
|
|
|
|
// Link To Transport
|
|
|
// -----------------
|
|
|
|
|
|
|
|
|
var CaptionStream = function CaptionStream(options) {
|
|
|
options = options || {};
|
|
|
CaptionStream.prototype.init.call(this); // parse708captions flag, default to true
|
|
|
|
|
|
this.parse708captions_ = typeof options.parse708captions === 'boolean' ? options.parse708captions : true;
|
|
|
this.captionPackets_ = [];
|
|
|
this.ccStreams_ = [new Cea608Stream(0, 0), // eslint-disable-line no-use-before-define
|
|
|
new Cea608Stream(0, 1), // eslint-disable-line no-use-before-define
|
|
|
new Cea608Stream(1, 0), // eslint-disable-line no-use-before-define
|
|
|
new Cea608Stream(1, 1) // eslint-disable-line no-use-before-define
|
|
|
];
|
|
|
|
|
|
if (this.parse708captions_) {
|
|
|
this.cc708Stream_ = new Cea708Stream(); // eslint-disable-line no-use-before-define
|
|
|
}
|
|
|
|
|
|
this.reset(); // forward data and done events from CCs to this CaptionStream
|
|
|
|
|
|
this.ccStreams_.forEach(function (cc) {
|
|
|
cc.on('data', this.trigger.bind(this, 'data'));
|
|
|
cc.on('partialdone', this.trigger.bind(this, 'partialdone'));
|
|
|
cc.on('done', this.trigger.bind(this, 'done'));
|
|
|
}, this);
|
|
|
|
|
|
if (this.parse708captions_) {
|
|
|
this.cc708Stream_.on('data', this.trigger.bind(this, 'data'));
|
|
|
this.cc708Stream_.on('partialdone', this.trigger.bind(this, 'partialdone'));
|
|
|
this.cc708Stream_.on('done', this.trigger.bind(this, 'done'));
|
|
|
}
|
|
|
};
|
|
|
|
|
|
CaptionStream.prototype = new stream();
|
|
|
|
|
|
CaptionStream.prototype.push = function (event) {
|
|
|
var sei, userData, newCaptionPackets; // only examine SEI NALs
|
|
|
|
|
|
if (event.nalUnitType !== 'sei_rbsp') {
|
|
|
return;
|
|
|
} // parse the sei
|
|
|
|
|
|
|
|
|
sei = captionPacketParser.parseSei(event.escapedRBSP); // no payload data, skip
|
|
|
|
|
|
if (!sei.payload) {
|
|
|
return;
|
|
|
} // ignore everything but user_data_registered_itu_t_t35
|
|
|
|
|
|
|
|
|
if (sei.payloadType !== captionPacketParser.USER_DATA_REGISTERED_ITU_T_T35) {
|
|
|
return;
|
|
|
} // parse out the user data payload
|
|
|
|
|
|
|
|
|
userData = captionPacketParser.parseUserData(sei); // ignore unrecognized userData
|
|
|
|
|
|
if (!userData) {
|
|
|
return;
|
|
|
} // Sometimes, the same segment # will be downloaded twice. To stop the
|
|
|
// caption data from being processed twice, we track the latest dts we've
|
|
|
// received and ignore everything with a dts before that. However, since
|
|
|
// data for a specific dts can be split across packets on either side of
|
|
|
// a segment boundary, we need to make sure we *don't* ignore the packets
|
|
|
// from the *next* segment that have dts === this.latestDts_. By constantly
|
|
|
// tracking the number of packets received with dts === this.latestDts_, we
|
|
|
// know how many should be ignored once we start receiving duplicates.
|
|
|
|
|
|
|
|
|
if (event.dts < this.latestDts_) {
|
|
|
// We've started getting older data, so set the flag.
|
|
|
this.ignoreNextEqualDts_ = true;
|
|
|
return;
|
|
|
} else if (event.dts === this.latestDts_ && this.ignoreNextEqualDts_) {
|
|
|
this.numSameDts_--;
|
|
|
|
|
|
if (!this.numSameDts_) {
|
|
|
// We've received the last duplicate packet, time to start processing again
|
|
|
this.ignoreNextEqualDts_ = false;
|
|
|
}
|
|
|
|
|
|
return;
|
|
|
} // parse out CC data packets and save them for later
|
|
|
|
|
|
|
|
|
newCaptionPackets = captionPacketParser.parseCaptionPackets(event.pts, userData);
|
|
|
this.captionPackets_ = this.captionPackets_.concat(newCaptionPackets);
|
|
|
|
|
|
if (this.latestDts_ !== event.dts) {
|
|
|
this.numSameDts_ = 0;
|
|
|
}
|
|
|
|
|
|
this.numSameDts_++;
|
|
|
this.latestDts_ = event.dts;
|
|
|
};
|
|
|
|
|
|
CaptionStream.prototype.flushCCStreams = function (flushType) {
|
|
|
this.ccStreams_.forEach(function (cc) {
|
|
|
return flushType === 'flush' ? cc.flush() : cc.partialFlush();
|
|
|
}, this);
|
|
|
};
|
|
|
|
|
|
CaptionStream.prototype.flushStream = function (flushType) {
|
|
|
// make sure we actually parsed captions before proceeding
|
|
|
if (!this.captionPackets_.length) {
|
|
|
this.flushCCStreams(flushType);
|
|
|
return;
|
|
|
} // In Chrome, the Array#sort function is not stable so add a
|
|
|
// presortIndex that we can use to ensure we get a stable-sort
|
|
|
|
|
|
|
|
|
this.captionPackets_.forEach(function (elem, idx) {
|
|
|
elem.presortIndex = idx;
|
|
|
}); // sort caption byte-pairs based on their PTS values
|
|
|
|
|
|
this.captionPackets_.sort(function (a, b) {
|
|
|
if (a.pts === b.pts) {
|
|
|
return a.presortIndex - b.presortIndex;
|
|
|
}
|
|
|
|
|
|
return a.pts - b.pts;
|
|
|
});
|
|
|
this.captionPackets_.forEach(function (packet) {
|
|
|
if (packet.type < 2) {
|
|
|
// Dispatch packet to the right Cea608Stream
|
|
|
this.dispatchCea608Packet(packet);
|
|
|
} else {
|
|
|
// Dispatch packet to the Cea708Stream
|
|
|
this.dispatchCea708Packet(packet);
|
|
|
}
|
|
|
}, this);
|
|
|
this.captionPackets_.length = 0;
|
|
|
this.flushCCStreams(flushType);
|
|
|
};
|
|
|
|
|
|
CaptionStream.prototype.flush = function () {
|
|
|
return this.flushStream('flush');
|
|
|
}; // Only called if handling partial data
|
|
|
|
|
|
|
|
|
CaptionStream.prototype.partialFlush = function () {
|
|
|
return this.flushStream('partialFlush');
|
|
|
};
|
|
|
|
|
|
CaptionStream.prototype.reset = function () {
|
|
|
this.latestDts_ = null;
|
|
|
this.ignoreNextEqualDts_ = false;
|
|
|
this.numSameDts_ = 0;
|
|
|
this.activeCea608Channel_ = [null, null];
|
|
|
this.ccStreams_.forEach(function (ccStream) {
|
|
|
ccStream.reset();
|
|
|
});
|
|
|
}; // From the CEA-608 spec:
|
|
|
|
|
|
/*
|
|
|
* When XDS sub-packets are interleaved with other services, the end of each sub-packet shall be followed
|
|
|
* by a control pair to change to a different service. When any of the control codes from 0x10 to 0x1F is
|
|
|
* used to begin a control code pair, it indicates the return to captioning or Text data. The control code pair
|
|
|
* and subsequent data should then be processed according to the FCC rules. It may be necessary for the
|
|
|
* line 21 data encoder to automatically insert a control code pair (i.e. RCL, RU2, RU3, RU4, RDC, or RTD)
|
|
|
* to switch to captioning or Text.
|
|
|
*/
|
|
|
// With that in mind, we ignore any data between an XDS control code and a
|
|
|
// subsequent closed-captioning control code.
|
|
|
|
|
|
|
|
|
CaptionStream.prototype.dispatchCea608Packet = function (packet) {
|
|
|
// NOTE: packet.type is the CEA608 field
|
|
|
if (this.setsTextOrXDSActive(packet)) {
|
|
|
this.activeCea608Channel_[packet.type] = null;
|
|
|
} else if (this.setsChannel1Active(packet)) {
|
|
|
this.activeCea608Channel_[packet.type] = 0;
|
|
|
} else if (this.setsChannel2Active(packet)) {
|
|
|
this.activeCea608Channel_[packet.type] = 1;
|
|
|
}
|
|
|
|
|
|
if (this.activeCea608Channel_[packet.type] === null) {
|
|
|
// If we haven't received anything to set the active channel, or the
|
|
|
// packets are Text/XDS data, discard the data; we don't want jumbled
|
|
|
// captions
|
|
|
return;
|
|
|
}
|
|
|
|
|
|
this.ccStreams_[(packet.type << 1) + this.activeCea608Channel_[packet.type]].push(packet);
|
|
|
};
|
|
|
|
|
|
CaptionStream.prototype.setsChannel1Active = function (packet) {
|
|
|
return (packet.ccData & 0x7800) === 0x1000;
|
|
|
};
|
|
|
|
|
|
CaptionStream.prototype.setsChannel2Active = function (packet) {
|
|
|
return (packet.ccData & 0x7800) === 0x1800;
|
|
|
};
|
|
|
|
|
|
CaptionStream.prototype.setsTextOrXDSActive = function (packet) {
|
|
|
return (packet.ccData & 0x7100) === 0x0100 || (packet.ccData & 0x78fe) === 0x102a || (packet.ccData & 0x78fe) === 0x182a;
|
|
|
};
|
|
|
|
|
|
CaptionStream.prototype.dispatchCea708Packet = function (packet) {
|
|
|
if (this.parse708captions_) {
|
|
|
this.cc708Stream_.push(packet);
|
|
|
}
|
|
|
}; // ----------------------
|
|
|
// Session to Application
|
|
|
// ----------------------
|
|
|
// This hash maps special and extended character codes to their
|
|
|
// proper Unicode equivalent. The first one-byte key is just a
|
|
|
// non-standard character code. The two-byte keys that follow are
|
|
|
// the extended CEA708 character codes, along with the preceding
|
|
|
// 0x10 extended character byte to distinguish these codes from
|
|
|
// non-extended character codes. Every CEA708 character code that
|
|
|
// is not in this object maps directly to a standard unicode
|
|
|
// character code.
|
|
|
// The transparent space and non-breaking transparent space are
|
|
|
// technically not fully supported since there is no code to
|
|
|
// make them transparent, so they have normal non-transparent
|
|
|
// stand-ins.
|
|
|
// The special closed caption (CC) character isn't a standard
|
|
|
// unicode character, so a fairly similar unicode character was
|
|
|
// chosen in it's place.
|
|
|
|
|
|
|
|
|
var CHARACTER_TRANSLATION_708 = {
|
|
|
0x7f: 0x266a,
|
|
|
// ♪
|
|
|
0x1020: 0x20,
|
|
|
// Transparent Space
|
|
|
0x1021: 0xa0,
|
|
|
// Nob-breaking Transparent Space
|
|
|
0x1025: 0x2026,
|
|
|
// …
|
|
|
0x102a: 0x0160,
|
|
|
// Š
|
|
|
0x102c: 0x0152,
|
|
|
// Œ
|
|
|
0x1030: 0x2588,
|
|
|
// █
|
|
|
0x1031: 0x2018,
|
|
|
// ‘
|
|
|
0x1032: 0x2019,
|
|
|
// ’
|
|
|
0x1033: 0x201c,
|
|
|
// “
|
|
|
0x1034: 0x201d,
|
|
|
// ”
|
|
|
0x1035: 0x2022,
|
|
|
// •
|
|
|
0x1039: 0x2122,
|
|
|
// ™
|
|
|
0x103a: 0x0161,
|
|
|
// š
|
|
|
0x103c: 0x0153,
|
|
|
// œ
|
|
|
0x103d: 0x2120,
|
|
|
// ℠
|
|
|
0x103f: 0x0178,
|
|
|
// Ÿ
|
|
|
0x1076: 0x215b,
|
|
|
// ⅛
|
|
|
0x1077: 0x215c,
|
|
|
// ⅜
|
|
|
0x1078: 0x215d,
|
|
|
// ⅝
|
|
|
0x1079: 0x215e,
|
|
|
// ⅞
|
|
|
0x107a: 0x23d0,
|
|
|
// ⏐
|
|
|
0x107b: 0x23a4,
|
|
|
// ⎤
|
|
|
0x107c: 0x23a3,
|
|
|
// ⎣
|
|
|
0x107d: 0x23af,
|
|
|
// ⎯
|
|
|
0x107e: 0x23a6,
|
|
|
// ⎦
|
|
|
0x107f: 0x23a1,
|
|
|
// ⎡
|
|
|
0x10a0: 0x3138 // ㄸ (CC char)
|
|
|
|
|
|
};
|
|
|
|
|
|
var get708CharFromCode = function get708CharFromCode(code) {
|
|
|
var newCode = CHARACTER_TRANSLATION_708[code] || code;
|
|
|
|
|
|
if (code & 0x1000 && code === newCode) {
|
|
|
// Invalid extended code
|
|
|
return '';
|
|
|
}
|
|
|
|
|
|
return String.fromCharCode(newCode);
|
|
|
};
|
|
|
|
|
|
var within708TextBlock = function within708TextBlock(b) {
|
|
|
return 0x20 <= b && b <= 0x7f || 0xa0 <= b && b <= 0xff;
|
|
|
};
|
|
|
|
|
|
var Cea708Window = function Cea708Window(windowNum) {
|
|
|
this.windowNum = windowNum;
|
|
|
this.reset();
|
|
|
};
|
|
|
|
|
|
Cea708Window.prototype.reset = function () {
|
|
|
this.clearText();
|
|
|
this.pendingNewLine = false;
|
|
|
this.winAttr = {};
|
|
|
this.penAttr = {};
|
|
|
this.penLoc = {};
|
|
|
this.penColor = {}; // These default values are arbitrary,
|
|
|
// defineWindow will usually override them
|
|
|
|
|
|
this.visible = 0;
|
|
|
this.rowLock = 0;
|
|
|
this.columnLock = 0;
|
|
|
this.priority = 0;
|
|
|
this.relativePositioning = 0;
|
|
|
this.anchorVertical = 0;
|
|
|
this.anchorHorizontal = 0;
|
|
|
this.anchorPoint = 0;
|
|
|
this.rowCount = 1;
|
|
|
this.virtualRowCount = this.rowCount + 1;
|
|
|
this.columnCount = 41;
|
|
|
this.windowStyle = 0;
|
|
|
this.penStyle = 0;
|
|
|
};
|
|
|
|
|
|
Cea708Window.prototype.getText = function () {
|
|
|
return this.rows.join('\n');
|
|
|
};
|
|
|
|
|
|
Cea708Window.prototype.clearText = function () {
|
|
|
this.rows = [''];
|
|
|
this.rowIdx = 0;
|
|
|
};
|
|
|
|
|
|
Cea708Window.prototype.newLine = function (pts) {
|
|
|
if (this.rows.length >= this.virtualRowCount && typeof this.beforeRowOverflow === 'function') {
|
|
|
this.beforeRowOverflow(pts);
|
|
|
}
|
|
|
|
|
|
if (this.rows.length > 0) {
|
|
|
this.rows.push('');
|
|
|
this.rowIdx++;
|
|
|
} // Show all virtual rows since there's no visible scrolling
|
|
|
|
|
|
|
|
|
while (this.rows.length > this.virtualRowCount) {
|
|
|
this.rows.shift();
|
|
|
this.rowIdx--;
|
|
|
}
|
|
|
};
|
|
|
|
|
|
Cea708Window.prototype.isEmpty = function () {
|
|
|
if (this.rows.length === 0) {
|
|
|
return true;
|
|
|
} else if (this.rows.length === 1) {
|
|
|
return this.rows[0] === '';
|
|
|
}
|
|
|
|
|
|
return false;
|
|
|
};
|
|
|
|
|
|
Cea708Window.prototype.addText = function (text) {
|
|
|
this.rows[this.rowIdx] += text;
|
|
|
};
|
|
|
|
|
|
Cea708Window.prototype.backspace = function () {
|
|
|
if (!this.isEmpty()) {
|
|
|
var row = this.rows[this.rowIdx];
|
|
|
this.rows[this.rowIdx] = row.substr(0, row.length - 1);
|
|
|
}
|
|
|
};
|
|
|
|
|
|
var Cea708Service = function Cea708Service(serviceNum) {
|
|
|
this.serviceNum = serviceNum;
|
|
|
this.text = '';
|
|
|
this.currentWindow = new Cea708Window(-1);
|
|
|
this.windows = [];
|
|
|
};
|
|
|
/**
|
|
|
* Initialize service windows
|
|
|
* Must be run before service use
|
|
|
*
|
|
|
* @param {Integer} pts PTS value
|
|
|
* @param {Function} beforeRowOverflow Function to execute before row overflow of a window
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea708Service.prototype.init = function (pts, beforeRowOverflow) {
|
|
|
this.startPts = pts;
|
|
|
|
|
|
for (var win = 0; win < 8; win++) {
|
|
|
this.windows[win] = new Cea708Window(win);
|
|
|
|
|
|
if (typeof beforeRowOverflow === 'function') {
|
|
|
this.windows[win].beforeRowOverflow = beforeRowOverflow;
|
|
|
}
|
|
|
}
|
|
|
};
|
|
|
/**
|
|
|
* Set current window of service to be affected by commands
|
|
|
*
|
|
|
* @param {Integer} windowNum Window number
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea708Service.prototype.setCurrentWindow = function (windowNum) {
|
|
|
this.currentWindow = this.windows[windowNum];
|
|
|
};
|
|
|
|
|
|
var Cea708Stream = function Cea708Stream() {
|
|
|
Cea708Stream.prototype.init.call(this);
|
|
|
var self = this;
|
|
|
this.current708Packet = null;
|
|
|
this.services = {};
|
|
|
|
|
|
this.push = function (packet) {
|
|
|
if (packet.type === 3) {
|
|
|
// 708 packet start
|
|
|
self.new708Packet();
|
|
|
self.add708Bytes(packet);
|
|
|
} else {
|
|
|
if (self.current708Packet === null) {
|
|
|
// This should only happen at the start of a file if there's no packet start.
|
|
|
self.new708Packet();
|
|
|
}
|
|
|
|
|
|
self.add708Bytes(packet);
|
|
|
}
|
|
|
};
|
|
|
};
|
|
|
|
|
|
Cea708Stream.prototype = new stream();
|
|
|
/**
|
|
|
* Push current 708 packet, create new 708 packet.
|
|
|
*/
|
|
|
|
|
|
Cea708Stream.prototype.new708Packet = function () {
|
|
|
if (this.current708Packet !== null) {
|
|
|
this.push708Packet();
|
|
|
}
|
|
|
|
|
|
this.current708Packet = {
|
|
|
data: [],
|
|
|
ptsVals: []
|
|
|
};
|
|
|
};
|
|
|
/**
|
|
|
* Add pts and both bytes from packet into current 708 packet.
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea708Stream.prototype.add708Bytes = function (packet) {
|
|
|
var data = packet.ccData;
|
|
|
var byte0 = data >>> 8;
|
|
|
var byte1 = data & 0xff; // I would just keep a list of packets instead of bytes, but it isn't clear in the spec
|
|
|
// that service blocks will always line up with byte pairs.
|
|
|
|
|
|
this.current708Packet.ptsVals.push(packet.pts);
|
|
|
this.current708Packet.data.push(byte0);
|
|
|
this.current708Packet.data.push(byte1);
|
|
|
};
|
|
|
/**
|
|
|
* Parse completed 708 packet into service blocks and push each service block.
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea708Stream.prototype.push708Packet = function () {
|
|
|
var packet708 = this.current708Packet;
|
|
|
var packetData = packet708.data;
|
|
|
var serviceNum = null;
|
|
|
var blockSize = null;
|
|
|
var i = 0;
|
|
|
var b = packetData[i++];
|
|
|
packet708.seq = b >> 6;
|
|
|
packet708.sizeCode = b & 0x3f; // 0b00111111;
|
|
|
|
|
|
for (; i < packetData.length; i++) {
|
|
|
b = packetData[i++];
|
|
|
serviceNum = b >> 5;
|
|
|
blockSize = b & 0x1f; // 0b00011111
|
|
|
|
|
|
if (serviceNum === 7 && blockSize > 0) {
|
|
|
// Extended service num
|
|
|
b = packetData[i++];
|
|
|
serviceNum = b;
|
|
|
}
|
|
|
|
|
|
this.pushServiceBlock(serviceNum, i, blockSize);
|
|
|
|
|
|
if (blockSize > 0) {
|
|
|
i += blockSize - 1;
|
|
|
}
|
|
|
}
|
|
|
};
|
|
|
/**
|
|
|
* Parse service block, execute commands, read text.
|
|
|
*
|
|
|
* Note: While many of these commands serve important purposes,
|
|
|
* many others just parse out the parameters or attributes, but
|
|
|
* nothing is done with them because this is not a full and complete
|
|
|
* implementation of the entire 708 spec.
|
|
|
*
|
|
|
* @param {Integer} serviceNum Service number
|
|
|
* @param {Integer} start Start index of the 708 packet data
|
|
|
* @param {Integer} size Block size
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea708Stream.prototype.pushServiceBlock = function (serviceNum, start, size) {
|
|
|
var b;
|
|
|
var i = start;
|
|
|
var packetData = this.current708Packet.data;
|
|
|
var service = this.services[serviceNum];
|
|
|
|
|
|
if (!service) {
|
|
|
service = this.initService(serviceNum, i);
|
|
|
}
|
|
|
|
|
|
for (; i < start + size && i < packetData.length; i++) {
|
|
|
b = packetData[i];
|
|
|
|
|
|
if (within708TextBlock(b)) {
|
|
|
i = this.handleText(i, service);
|
|
|
} else if (b === 0x10) {
|
|
|
i = this.extendedCommands(i, service);
|
|
|
} else if (0x80 <= b && b <= 0x87) {
|
|
|
i = this.setCurrentWindow(i, service);
|
|
|
} else if (0x98 <= b && b <= 0x9f) {
|
|
|
i = this.defineWindow(i, service);
|
|
|
} else if (b === 0x88) {
|
|
|
i = this.clearWindows(i, service);
|
|
|
} else if (b === 0x8c) {
|
|
|
i = this.deleteWindows(i, service);
|
|
|
} else if (b === 0x89) {
|
|
|
i = this.displayWindows(i, service);
|
|
|
} else if (b === 0x8a) {
|
|
|
i = this.hideWindows(i, service);
|
|
|
} else if (b === 0x8b) {
|
|
|
i = this.toggleWindows(i, service);
|
|
|
} else if (b === 0x97) {
|
|
|
i = this.setWindowAttributes(i, service);
|
|
|
} else if (b === 0x90) {
|
|
|
i = this.setPenAttributes(i, service);
|
|
|
} else if (b === 0x91) {
|
|
|
i = this.setPenColor(i, service);
|
|
|
} else if (b === 0x92) {
|
|
|
i = this.setPenLocation(i, service);
|
|
|
} else if (b === 0x8f) {
|
|
|
service = this.reset(i, service);
|
|
|
} else if (b === 0x08) {
|
|
|
// BS: Backspace
|
|
|
service.currentWindow.backspace();
|
|
|
} else if (b === 0x0c) {
|
|
|
// FF: Form feed
|
|
|
service.currentWindow.clearText();
|
|
|
} else if (b === 0x0d) {
|
|
|
// CR: Carriage return
|
|
|
service.currentWindow.pendingNewLine = true;
|
|
|
} else if (b === 0x0e) {
|
|
|
// HCR: Horizontal carriage return
|
|
|
service.currentWindow.clearText();
|
|
|
} else if (b === 0x8d) {
|
|
|
// DLY: Delay, nothing to do
|
|
|
i++;
|
|
|
} else ;
|
|
|
}
|
|
|
};
|
|
|
/**
|
|
|
* Execute an extended command
|
|
|
*
|
|
|
* @param {Integer} i Current index in the 708 packet
|
|
|
* @param {Service} service The service object to be affected
|
|
|
* @return {Integer} New index after parsing
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea708Stream.prototype.extendedCommands = function (i, service) {
|
|
|
var packetData = this.current708Packet.data;
|
|
|
var b = packetData[++i];
|
|
|
|
|
|
if (within708TextBlock(b)) {
|
|
|
i = this.handleText(i, service, true);
|
|
|
}
|
|
|
|
|
|
return i;
|
|
|
};
|
|
|
/**
|
|
|
* Get PTS value of a given byte index
|
|
|
*
|
|
|
* @param {Integer} byteIndex Index of the byte
|
|
|
* @return {Integer} PTS
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea708Stream.prototype.getPts = function (byteIndex) {
|
|
|
// There's 1 pts value per 2 bytes
|
|
|
return this.current708Packet.ptsVals[Math.floor(byteIndex / 2)];
|
|
|
};
|
|
|
/**
|
|
|
* Initializes a service
|
|
|
*
|
|
|
* @param {Integer} serviceNum Service number
|
|
|
* @return {Service} Initialized service object
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea708Stream.prototype.initService = function (serviceNum, i) {
|
|
|
var self = this;
|
|
|
this.services[serviceNum] = new Cea708Service(serviceNum);
|
|
|
this.services[serviceNum].init(this.getPts(i), function (pts) {
|
|
|
self.flushDisplayed(pts, self.services[serviceNum]);
|
|
|
});
|
|
|
return this.services[serviceNum];
|
|
|
};
|
|
|
/**
|
|
|
* Execute text writing to current window
|
|
|
*
|
|
|
* @param {Integer} i Current index in the 708 packet
|
|
|
* @param {Service} service The service object to be affected
|
|
|
* @return {Integer} New index after parsing
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea708Stream.prototype.handleText = function (i, service, isExtended) {
|
|
|
var packetData = this.current708Packet.data;
|
|
|
var b = packetData[i];
|
|
|
var extended = isExtended ? 0x1000 : 0x0000;
|
|
|
var char = get708CharFromCode(extended | b);
|
|
|
var win = service.currentWindow;
|
|
|
|
|
|
if (win.pendingNewLine && !win.isEmpty()) {
|
|
|
win.newLine(this.getPts(i));
|
|
|
}
|
|
|
|
|
|
win.pendingNewLine = false;
|
|
|
win.addText(char);
|
|
|
return i;
|
|
|
};
|
|
|
/**
|
|
|
* Parse and execute the CW# command.
|
|
|
*
|
|
|
* Set the current window.
|
|
|
*
|
|
|
* @param {Integer} i Current index in the 708 packet
|
|
|
* @param {Service} service The service object to be affected
|
|
|
* @return {Integer} New index after parsing
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea708Stream.prototype.setCurrentWindow = function (i, service) {
|
|
|
var packetData = this.current708Packet.data;
|
|
|
var b = packetData[i];
|
|
|
var windowNum = b & 0x07;
|
|
|
service.setCurrentWindow(windowNum);
|
|
|
return i;
|
|
|
};
|
|
|
/**
|
|
|
* Parse and execute the DF# command.
|
|
|
*
|
|
|
* Define a window and set it as the current window.
|
|
|
*
|
|
|
* @param {Integer} i Current index in the 708 packet
|
|
|
* @param {Service} service The service object to be affected
|
|
|
* @return {Integer} New index after parsing
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea708Stream.prototype.defineWindow = function (i, service) {
|
|
|
var packetData = this.current708Packet.data;
|
|
|
var b = packetData[i];
|
|
|
var windowNum = b & 0x07;
|
|
|
service.setCurrentWindow(windowNum);
|
|
|
var win = service.currentWindow;
|
|
|
b = packetData[++i];
|
|
|
win.visible = (b & 0x20) >> 5; // v
|
|
|
|
|
|
win.rowLock = (b & 0x10) >> 4; // rl
|
|
|
|
|
|
win.columnLock = (b & 0x08) >> 3; // cl
|
|
|
|
|
|
win.priority = b & 0x07; // p
|
|
|
|
|
|
b = packetData[++i];
|
|
|
win.relativePositioning = (b & 0x80) >> 7; // rp
|
|
|
|
|
|
win.anchorVertical = b & 0x7f; // av
|
|
|
|
|
|
b = packetData[++i];
|
|
|
win.anchorHorizontal = b; // ah
|
|
|
|
|
|
b = packetData[++i];
|
|
|
win.anchorPoint = (b & 0xf0) >> 4; // ap
|
|
|
|
|
|
win.rowCount = b & 0x0f; // rc
|
|
|
|
|
|
b = packetData[++i];
|
|
|
win.columnCount = b & 0x3f; // cc
|
|
|
|
|
|
b = packetData[++i];
|
|
|
win.windowStyle = (b & 0x38) >> 3; // ws
|
|
|
|
|
|
win.penStyle = b & 0x07; // ps
|
|
|
// The spec says there are (rowCount+1) "virtual rows"
|
|
|
|
|
|
win.virtualRowCount = win.rowCount + 1;
|
|
|
return i;
|
|
|
};
|
|
|
/**
|
|
|
* Parse and execute the SWA command.
|
|
|
*
|
|
|
* Set attributes of the current window.
|
|
|
*
|
|
|
* @param {Integer} i Current index in the 708 packet
|
|
|
* @param {Service} service The service object to be affected
|
|
|
* @return {Integer} New index after parsing
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea708Stream.prototype.setWindowAttributes = function (i, service) {
|
|
|
var packetData = this.current708Packet.data;
|
|
|
var b = packetData[i];
|
|
|
var winAttr = service.currentWindow.winAttr;
|
|
|
b = packetData[++i];
|
|
|
winAttr.fillOpacity = (b & 0xc0) >> 6; // fo
|
|
|
|
|
|
winAttr.fillRed = (b & 0x30) >> 4; // fr
|
|
|
|
|
|
winAttr.fillGreen = (b & 0x0c) >> 2; // fg
|
|
|
|
|
|
winAttr.fillBlue = b & 0x03; // fb
|
|
|
|
|
|
b = packetData[++i];
|
|
|
winAttr.borderType = (b & 0xc0) >> 6; // bt
|
|
|
|
|
|
winAttr.borderRed = (b & 0x30) >> 4; // br
|
|
|
|
|
|
winAttr.borderGreen = (b & 0x0c) >> 2; // bg
|
|
|
|
|
|
winAttr.borderBlue = b & 0x03; // bb
|
|
|
|
|
|
b = packetData[++i];
|
|
|
winAttr.borderType += (b & 0x80) >> 5; // bt
|
|
|
|
|
|
winAttr.wordWrap = (b & 0x40) >> 6; // ww
|
|
|
|
|
|
winAttr.printDirection = (b & 0x30) >> 4; // pd
|
|
|
|
|
|
winAttr.scrollDirection = (b & 0x0c) >> 2; // sd
|
|
|
|
|
|
winAttr.justify = b & 0x03; // j
|
|
|
|
|
|
b = packetData[++i];
|
|
|
winAttr.effectSpeed = (b & 0xf0) >> 4; // es
|
|
|
|
|
|
winAttr.effectDirection = (b & 0x0c) >> 2; // ed
|
|
|
|
|
|
winAttr.displayEffect = b & 0x03; // de
|
|
|
|
|
|
return i;
|
|
|
};
|
|
|
/**
|
|
|
* Gather text from all displayed windows and push a caption to output.
|
|
|
*
|
|
|
* @param {Integer} i Current index in the 708 packet
|
|
|
* @param {Service} service The service object to be affected
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea708Stream.prototype.flushDisplayed = function (pts, service) {
|
|
|
var displayedText = []; // TODO: Positioning not supported, displaying multiple windows will not necessarily
|
|
|
// display text in the correct order, but sample files so far have not shown any issue.
|
|
|
|
|
|
for (var winId = 0; winId < 8; winId++) {
|
|
|
if (service.windows[winId].visible && !service.windows[winId].isEmpty()) {
|
|
|
displayedText.push(service.windows[winId].getText());
|
|
|
}
|
|
|
}
|
|
|
|
|
|
service.endPts = pts;
|
|
|
service.text = displayedText.join('\n\n');
|
|
|
this.pushCaption(service);
|
|
|
service.startPts = pts;
|
|
|
};
|
|
|
/**
|
|
|
* Push a caption to output if the caption contains text.
|
|
|
*
|
|
|
* @param {Service} service The service object to be affected
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea708Stream.prototype.pushCaption = function (service) {
|
|
|
if (service.text !== '') {
|
|
|
this.trigger('data', {
|
|
|
startPts: service.startPts,
|
|
|
endPts: service.endPts,
|
|
|
text: service.text,
|
|
|
stream: 'cc708_' + service.serviceNum
|
|
|
});
|
|
|
service.text = '';
|
|
|
service.startPts = service.endPts;
|
|
|
}
|
|
|
};
|
|
|
/**
|
|
|
* Parse and execute the DSW command.
|
|
|
*
|
|
|
* Set visible property of windows based on the parsed bitmask.
|
|
|
*
|
|
|
* @param {Integer} i Current index in the 708 packet
|
|
|
* @param {Service} service The service object to be affected
|
|
|
* @return {Integer} New index after parsing
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea708Stream.prototype.displayWindows = function (i, service) {
|
|
|
var packetData = this.current708Packet.data;
|
|
|
var b = packetData[++i];
|
|
|
var pts = this.getPts(i);
|
|
|
this.flushDisplayed(pts, service);
|
|
|
|
|
|
for (var winId = 0; winId < 8; winId++) {
|
|
|
if (b & 0x01 << winId) {
|
|
|
service.windows[winId].visible = 1;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
return i;
|
|
|
};
|
|
|
/**
|
|
|
* Parse and execute the HDW command.
|
|
|
*
|
|
|
* Set visible property of windows based on the parsed bitmask.
|
|
|
*
|
|
|
* @param {Integer} i Current index in the 708 packet
|
|
|
* @param {Service} service The service object to be affected
|
|
|
* @return {Integer} New index after parsing
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea708Stream.prototype.hideWindows = function (i, service) {
|
|
|
var packetData = this.current708Packet.data;
|
|
|
var b = packetData[++i];
|
|
|
var pts = this.getPts(i);
|
|
|
this.flushDisplayed(pts, service);
|
|
|
|
|
|
for (var winId = 0; winId < 8; winId++) {
|
|
|
if (b & 0x01 << winId) {
|
|
|
service.windows[winId].visible = 0;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
return i;
|
|
|
};
|
|
|
/**
|
|
|
* Parse and execute the TGW command.
|
|
|
*
|
|
|
* Set visible property of windows based on the parsed bitmask.
|
|
|
*
|
|
|
* @param {Integer} i Current index in the 708 packet
|
|
|
* @param {Service} service The service object to be affected
|
|
|
* @return {Integer} New index after parsing
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea708Stream.prototype.toggleWindows = function (i, service) {
|
|
|
var packetData = this.current708Packet.data;
|
|
|
var b = packetData[++i];
|
|
|
var pts = this.getPts(i);
|
|
|
this.flushDisplayed(pts, service);
|
|
|
|
|
|
for (var winId = 0; winId < 8; winId++) {
|
|
|
if (b & 0x01 << winId) {
|
|
|
service.windows[winId].visible ^= 1;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
return i;
|
|
|
};
|
|
|
/**
|
|
|
* Parse and execute the CLW command.
|
|
|
*
|
|
|
* Clear text of windows based on the parsed bitmask.
|
|
|
*
|
|
|
* @param {Integer} i Current index in the 708 packet
|
|
|
* @param {Service} service The service object to be affected
|
|
|
* @return {Integer} New index after parsing
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea708Stream.prototype.clearWindows = function (i, service) {
|
|
|
var packetData = this.current708Packet.data;
|
|
|
var b = packetData[++i];
|
|
|
var pts = this.getPts(i);
|
|
|
this.flushDisplayed(pts, service);
|
|
|
|
|
|
for (var winId = 0; winId < 8; winId++) {
|
|
|
if (b & 0x01 << winId) {
|
|
|
service.windows[winId].clearText();
|
|
|
}
|
|
|
}
|
|
|
|
|
|
return i;
|
|
|
};
|
|
|
/**
|
|
|
* Parse and execute the DLW command.
|
|
|
*
|
|
|
* Re-initialize windows based on the parsed bitmask.
|
|
|
*
|
|
|
* @param {Integer} i Current index in the 708 packet
|
|
|
* @param {Service} service The service object to be affected
|
|
|
* @return {Integer} New index after parsing
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea708Stream.prototype.deleteWindows = function (i, service) {
|
|
|
var packetData = this.current708Packet.data;
|
|
|
var b = packetData[++i];
|
|
|
var pts = this.getPts(i);
|
|
|
this.flushDisplayed(pts, service);
|
|
|
|
|
|
for (var winId = 0; winId < 8; winId++) {
|
|
|
if (b & 0x01 << winId) {
|
|
|
service.windows[winId].reset();
|
|
|
}
|
|
|
}
|
|
|
|
|
|
return i;
|
|
|
};
|
|
|
/**
|
|
|
* Parse and execute the SPA command.
|
|
|
*
|
|
|
* Set pen attributes of the current window.
|
|
|
*
|
|
|
* @param {Integer} i Current index in the 708 packet
|
|
|
* @param {Service} service The service object to be affected
|
|
|
* @return {Integer} New index after parsing
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea708Stream.prototype.setPenAttributes = function (i, service) {
|
|
|
var packetData = this.current708Packet.data;
|
|
|
var b = packetData[i];
|
|
|
var penAttr = service.currentWindow.penAttr;
|
|
|
b = packetData[++i];
|
|
|
penAttr.textTag = (b & 0xf0) >> 4; // tt
|
|
|
|
|
|
penAttr.offset = (b & 0x0c) >> 2; // o
|
|
|
|
|
|
penAttr.penSize = b & 0x03; // s
|
|
|
|
|
|
b = packetData[++i];
|
|
|
penAttr.italics = (b & 0x80) >> 7; // i
|
|
|
|
|
|
penAttr.underline = (b & 0x40) >> 6; // u
|
|
|
|
|
|
penAttr.edgeType = (b & 0x38) >> 3; // et
|
|
|
|
|
|
penAttr.fontStyle = b & 0x07; // fs
|
|
|
|
|
|
return i;
|
|
|
};
|
|
|
/**
|
|
|
* Parse and execute the SPC command.
|
|
|
*
|
|
|
* Set pen color of the current window.
|
|
|
*
|
|
|
* @param {Integer} i Current index in the 708 packet
|
|
|
* @param {Service} service The service object to be affected
|
|
|
* @return {Integer} New index after parsing
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea708Stream.prototype.setPenColor = function (i, service) {
|
|
|
var packetData = this.current708Packet.data;
|
|
|
var b = packetData[i];
|
|
|
var penColor = service.currentWindow.penColor;
|
|
|
b = packetData[++i];
|
|
|
penColor.fgOpacity = (b & 0xc0) >> 6; // fo
|
|
|
|
|
|
penColor.fgRed = (b & 0x30) >> 4; // fr
|
|
|
|
|
|
penColor.fgGreen = (b & 0x0c) >> 2; // fg
|
|
|
|
|
|
penColor.fgBlue = b & 0x03; // fb
|
|
|
|
|
|
b = packetData[++i];
|
|
|
penColor.bgOpacity = (b & 0xc0) >> 6; // bo
|
|
|
|
|
|
penColor.bgRed = (b & 0x30) >> 4; // br
|
|
|
|
|
|
penColor.bgGreen = (b & 0x0c) >> 2; // bg
|
|
|
|
|
|
penColor.bgBlue = b & 0x03; // bb
|
|
|
|
|
|
b = packetData[++i];
|
|
|
penColor.edgeRed = (b & 0x30) >> 4; // er
|
|
|
|
|
|
penColor.edgeGreen = (b & 0x0c) >> 2; // eg
|
|
|
|
|
|
penColor.edgeBlue = b & 0x03; // eb
|
|
|
|
|
|
return i;
|
|
|
};
|
|
|
/**
|
|
|
* Parse and execute the SPL command.
|
|
|
*
|
|
|
* Set pen location of the current window.
|
|
|
*
|
|
|
* @param {Integer} i Current index in the 708 packet
|
|
|
* @param {Service} service The service object to be affected
|
|
|
* @return {Integer} New index after parsing
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea708Stream.prototype.setPenLocation = function (i, service) {
|
|
|
var packetData = this.current708Packet.data;
|
|
|
var b = packetData[i];
|
|
|
var penLoc = service.currentWindow.penLoc; // Positioning isn't really supported at the moment, so this essentially just inserts a linebreak
|
|
|
|
|
|
service.currentWindow.pendingNewLine = true;
|
|
|
b = packetData[++i];
|
|
|
penLoc.row = b & 0x0f; // r
|
|
|
|
|
|
b = packetData[++i];
|
|
|
penLoc.column = b & 0x3f; // c
|
|
|
|
|
|
return i;
|
|
|
};
|
|
|
/**
|
|
|
* Execute the RST command.
|
|
|
*
|
|
|
* Reset service to a clean slate. Re-initialize.
|
|
|
*
|
|
|
* @param {Integer} i Current index in the 708 packet
|
|
|
* @param {Service} service The service object to be affected
|
|
|
* @return {Service} Re-initialized service
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea708Stream.prototype.reset = function (i, service) {
|
|
|
var pts = this.getPts(i);
|
|
|
this.flushDisplayed(pts, service);
|
|
|
return this.initService(service.serviceNum, i);
|
|
|
}; // This hash maps non-ASCII, special, and extended character codes to their
|
|
|
// proper Unicode equivalent. The first keys that are only a single byte
|
|
|
// are the non-standard ASCII characters, which simply map the CEA608 byte
|
|
|
// to the standard ASCII/Unicode. The two-byte keys that follow are the CEA608
|
|
|
// character codes, but have their MSB bitmasked with 0x03 so that a lookup
|
|
|
// can be performed regardless of the field and data channel on which the
|
|
|
// character code was received.
|
|
|
|
|
|
|
|
|
var CHARACTER_TRANSLATION = {
|
|
|
0x2a: 0xe1,
|
|
|
// á
|
|
|
0x5c: 0xe9,
|
|
|
// é
|
|
|
0x5e: 0xed,
|
|
|
// í
|
|
|
0x5f: 0xf3,
|
|
|
// ó
|
|
|
0x60: 0xfa,
|
|
|
// ú
|
|
|
0x7b: 0xe7,
|
|
|
// ç
|
|
|
0x7c: 0xf7,
|
|
|
// ÷
|
|
|
0x7d: 0xd1,
|
|
|
// Ñ
|
|
|
0x7e: 0xf1,
|
|
|
// ñ
|
|
|
0x7f: 0x2588,
|
|
|
// █
|
|
|
0x0130: 0xae,
|
|
|
// ®
|
|
|
0x0131: 0xb0,
|
|
|
// °
|
|
|
0x0132: 0xbd,
|
|
|
// ½
|
|
|
0x0133: 0xbf,
|
|
|
// ¿
|
|
|
0x0134: 0x2122,
|
|
|
// ™
|
|
|
0x0135: 0xa2,
|
|
|
// ¢
|
|
|
0x0136: 0xa3,
|
|
|
// £
|
|
|
0x0137: 0x266a,
|
|
|
// ♪
|
|
|
0x0138: 0xe0,
|
|
|
// à
|
|
|
0x0139: 0xa0,
|
|
|
//
|
|
|
0x013a: 0xe8,
|
|
|
// è
|
|
|
0x013b: 0xe2,
|
|
|
// â
|
|
|
0x013c: 0xea,
|
|
|
// ê
|
|
|
0x013d: 0xee,
|
|
|
// î
|
|
|
0x013e: 0xf4,
|
|
|
// ô
|
|
|
0x013f: 0xfb,
|
|
|
// û
|
|
|
0x0220: 0xc1,
|
|
|
// Á
|
|
|
0x0221: 0xc9,
|
|
|
// É
|
|
|
0x0222: 0xd3,
|
|
|
// Ó
|
|
|
0x0223: 0xda,
|
|
|
// Ú
|
|
|
0x0224: 0xdc,
|
|
|
// Ü
|
|
|
0x0225: 0xfc,
|
|
|
// ü
|
|
|
0x0226: 0x2018,
|
|
|
// ‘
|
|
|
0x0227: 0xa1,
|
|
|
// ¡
|
|
|
0x0228: 0x2a,
|
|
|
// *
|
|
|
0x0229: 0x27,
|
|
|
// '
|
|
|
0x022a: 0x2014,
|
|
|
// —
|
|
|
0x022b: 0xa9,
|
|
|
// ©
|
|
|
0x022c: 0x2120,
|
|
|
// ℠
|
|
|
0x022d: 0x2022,
|
|
|
// •
|
|
|
0x022e: 0x201c,
|
|
|
// “
|
|
|
0x022f: 0x201d,
|
|
|
// ”
|
|
|
0x0230: 0xc0,
|
|
|
// À
|
|
|
0x0231: 0xc2,
|
|
|
// Â
|
|
|
0x0232: 0xc7,
|
|
|
// Ç
|
|
|
0x0233: 0xc8,
|
|
|
// È
|
|
|
0x0234: 0xca,
|
|
|
// Ê
|
|
|
0x0235: 0xcb,
|
|
|
// Ë
|
|
|
0x0236: 0xeb,
|
|
|
// ë
|
|
|
0x0237: 0xce,
|
|
|
// Î
|
|
|
0x0238: 0xcf,
|
|
|
// Ï
|
|
|
0x0239: 0xef,
|
|
|
// ï
|
|
|
0x023a: 0xd4,
|
|
|
// Ô
|
|
|
0x023b: 0xd9,
|
|
|
// Ù
|
|
|
0x023c: 0xf9,
|
|
|
// ù
|
|
|
0x023d: 0xdb,
|
|
|
// Û
|
|
|
0x023e: 0xab,
|
|
|
// «
|
|
|
0x023f: 0xbb,
|
|
|
// »
|
|
|
0x0320: 0xc3,
|
|
|
// Ã
|
|
|
0x0321: 0xe3,
|
|
|
// ã
|
|
|
0x0322: 0xcd,
|
|
|
// Í
|
|
|
0x0323: 0xcc,
|
|
|
// Ì
|
|
|
0x0324: 0xec,
|
|
|
// ì
|
|
|
0x0325: 0xd2,
|
|
|
// Ò
|
|
|
0x0326: 0xf2,
|
|
|
// ò
|
|
|
0x0327: 0xd5,
|
|
|
// Õ
|
|
|
0x0328: 0xf5,
|
|
|
// õ
|
|
|
0x0329: 0x7b,
|
|
|
// {
|
|
|
0x032a: 0x7d,
|
|
|
// }
|
|
|
0x032b: 0x5c,
|
|
|
// \
|
|
|
0x032c: 0x5e,
|
|
|
// ^
|
|
|
0x032d: 0x5f,
|
|
|
// _
|
|
|
0x032e: 0x7c,
|
|
|
// |
|
|
|
0x032f: 0x7e,
|
|
|
// ~
|
|
|
0x0330: 0xc4,
|
|
|
// Ä
|
|
|
0x0331: 0xe4,
|
|
|
// ä
|
|
|
0x0332: 0xd6,
|
|
|
// Ö
|
|
|
0x0333: 0xf6,
|
|
|
// ö
|
|
|
0x0334: 0xdf,
|
|
|
// ß
|
|
|
0x0335: 0xa5,
|
|
|
// ¥
|
|
|
0x0336: 0xa4,
|
|
|
// ¤
|
|
|
0x0337: 0x2502,
|
|
|
// │
|
|
|
0x0338: 0xc5,
|
|
|
// Å
|
|
|
0x0339: 0xe5,
|
|
|
// å
|
|
|
0x033a: 0xd8,
|
|
|
// Ø
|
|
|
0x033b: 0xf8,
|
|
|
// ø
|
|
|
0x033c: 0x250c,
|
|
|
// ┌
|
|
|
0x033d: 0x2510,
|
|
|
// ┐
|
|
|
0x033e: 0x2514,
|
|
|
// └
|
|
|
0x033f: 0x2518 // ┘
|
|
|
|
|
|
};
|
|
|
|
|
|
var getCharFromCode = function getCharFromCode(code) {
|
|
|
if (code === null) {
|
|
|
return '';
|
|
|
}
|
|
|
|
|
|
code = CHARACTER_TRANSLATION[code] || code;
|
|
|
return String.fromCharCode(code);
|
|
|
}; // the index of the last row in a CEA-608 display buffer
|
|
|
|
|
|
|
|
|
var BOTTOM_ROW = 14; // This array is used for mapping PACs -> row #, since there's no way of
|
|
|
// getting it through bit logic.
|
|
|
|
|
|
var ROWS = [0x1100, 0x1120, 0x1200, 0x1220, 0x1500, 0x1520, 0x1600, 0x1620, 0x1700, 0x1720, 0x1000, 0x1300, 0x1320, 0x1400, 0x1420]; // CEA-608 captions are rendered onto a 34x15 matrix of character
|
|
|
// cells. The "bottom" row is the last element in the outer array.
|
|
|
|
|
|
var createDisplayBuffer = function createDisplayBuffer() {
|
|
|
var result = [],
|
|
|
i = BOTTOM_ROW + 1;
|
|
|
|
|
|
while (i--) {
|
|
|
result.push('');
|
|
|
}
|
|
|
|
|
|
return result;
|
|
|
};
|
|
|
|
|
|
var Cea608Stream = function Cea608Stream(field, dataChannel) {
|
|
|
Cea608Stream.prototype.init.call(this);
|
|
|
this.field_ = field || 0;
|
|
|
this.dataChannel_ = dataChannel || 0;
|
|
|
this.name_ = 'CC' + ((this.field_ << 1 | this.dataChannel_) + 1);
|
|
|
this.setConstants();
|
|
|
this.reset();
|
|
|
|
|
|
this.push = function (packet) {
|
|
|
var data, swap, char0, char1, text; // remove the parity bits
|
|
|
|
|
|
data = packet.ccData & 0x7f7f; // ignore duplicate control codes; the spec demands they're sent twice
|
|
|
|
|
|
if (data === this.lastControlCode_) {
|
|
|
this.lastControlCode_ = null;
|
|
|
return;
|
|
|
} // Store control codes
|
|
|
|
|
|
|
|
|
if ((data & 0xf000) === 0x1000) {
|
|
|
this.lastControlCode_ = data;
|
|
|
} else if (data !== this.PADDING_) {
|
|
|
this.lastControlCode_ = null;
|
|
|
}
|
|
|
|
|
|
char0 = data >>> 8;
|
|
|
char1 = data & 0xff;
|
|
|
|
|
|
if (data === this.PADDING_) {
|
|
|
return;
|
|
|
} else if (data === this.RESUME_CAPTION_LOADING_) {
|
|
|
this.mode_ = 'popOn';
|
|
|
} else if (data === this.END_OF_CAPTION_) {
|
|
|
// If an EOC is received while in paint-on mode, the displayed caption
|
|
|
// text should be swapped to non-displayed memory as if it was a pop-on
|
|
|
// caption. Because of that, we should explicitly switch back to pop-on
|
|
|
// mode
|
|
|
this.mode_ = 'popOn';
|
|
|
this.clearFormatting(packet.pts); // if a caption was being displayed, it's gone now
|
|
|
|
|
|
this.flushDisplayed(packet.pts); // flip memory
|
|
|
|
|
|
swap = this.displayed_;
|
|
|
this.displayed_ = this.nonDisplayed_;
|
|
|
this.nonDisplayed_ = swap; // start measuring the time to display the caption
|
|
|
|
|
|
this.startPts_ = packet.pts;
|
|
|
} else if (data === this.ROLL_UP_2_ROWS_) {
|
|
|
this.rollUpRows_ = 2;
|
|
|
this.setRollUp(packet.pts);
|
|
|
} else if (data === this.ROLL_UP_3_ROWS_) {
|
|
|
this.rollUpRows_ = 3;
|
|
|
this.setRollUp(packet.pts);
|
|
|
} else if (data === this.ROLL_UP_4_ROWS_) {
|
|
|
this.rollUpRows_ = 4;
|
|
|
this.setRollUp(packet.pts);
|
|
|
} else if (data === this.CARRIAGE_RETURN_) {
|
|
|
this.clearFormatting(packet.pts);
|
|
|
this.flushDisplayed(packet.pts);
|
|
|
this.shiftRowsUp_();
|
|
|
this.startPts_ = packet.pts;
|
|
|
} else if (data === this.BACKSPACE_) {
|
|
|
if (this.mode_ === 'popOn') {
|
|
|
this.nonDisplayed_[this.row_] = this.nonDisplayed_[this.row_].slice(0, -1);
|
|
|
} else {
|
|
|
this.displayed_[this.row_] = this.displayed_[this.row_].slice(0, -1);
|
|
|
}
|
|
|
} else if (data === this.ERASE_DISPLAYED_MEMORY_) {
|
|
|
this.flushDisplayed(packet.pts);
|
|
|
this.displayed_ = createDisplayBuffer();
|
|
|
} else if (data === this.ERASE_NON_DISPLAYED_MEMORY_) {
|
|
|
this.nonDisplayed_ = createDisplayBuffer();
|
|
|
} else if (data === this.RESUME_DIRECT_CAPTIONING_) {
|
|
|
if (this.mode_ !== 'paintOn') {
|
|
|
// NOTE: This should be removed when proper caption positioning is
|
|
|
// implemented
|
|
|
this.flushDisplayed(packet.pts);
|
|
|
this.displayed_ = createDisplayBuffer();
|
|
|
}
|
|
|
|
|
|
this.mode_ = 'paintOn';
|
|
|
this.startPts_ = packet.pts; // Append special characters to caption text
|
|
|
} else if (this.isSpecialCharacter(char0, char1)) {
|
|
|
// Bitmask char0 so that we can apply character transformations
|
|
|
// regardless of field and data channel.
|
|
|
// Then byte-shift to the left and OR with char1 so we can pass the
|
|
|
// entire character code to `getCharFromCode`.
|
|
|
char0 = (char0 & 0x03) << 8;
|
|
|
text = getCharFromCode(char0 | char1);
|
|
|
this[this.mode_](packet.pts, text);
|
|
|
this.column_++; // Append extended characters to caption text
|
|
|
} else if (this.isExtCharacter(char0, char1)) {
|
|
|
// Extended characters always follow their "non-extended" equivalents.
|
|
|
// IE if a "è" is desired, you'll always receive "eè"; non-compliant
|
|
|
// decoders are supposed to drop the "è", while compliant decoders
|
|
|
// backspace the "e" and insert "è".
|
|
|
// Delete the previous character
|
|
|
if (this.mode_ === 'popOn') {
|
|
|
this.nonDisplayed_[this.row_] = this.nonDisplayed_[this.row_].slice(0, -1);
|
|
|
} else {
|
|
|
this.displayed_[this.row_] = this.displayed_[this.row_].slice(0, -1);
|
|
|
} // Bitmask char0 so that we can apply character transformations
|
|
|
// regardless of field and data channel.
|
|
|
// Then byte-shift to the left and OR with char1 so we can pass the
|
|
|
// entire character code to `getCharFromCode`.
|
|
|
|
|
|
|
|
|
char0 = (char0 & 0x03) << 8;
|
|
|
text = getCharFromCode(char0 | char1);
|
|
|
this[this.mode_](packet.pts, text);
|
|
|
this.column_++; // Process mid-row codes
|
|
|
} else if (this.isMidRowCode(char0, char1)) {
|
|
|
// Attributes are not additive, so clear all formatting
|
|
|
this.clearFormatting(packet.pts); // According to the standard, mid-row codes
|
|
|
// should be replaced with spaces, so add one now
|
|
|
|
|
|
this[this.mode_](packet.pts, ' ');
|
|
|
this.column_++;
|
|
|
|
|
|
if ((char1 & 0xe) === 0xe) {
|
|
|
this.addFormatting(packet.pts, ['i']);
|
|
|
}
|
|
|
|
|
|
if ((char1 & 0x1) === 0x1) {
|
|
|
this.addFormatting(packet.pts, ['u']);
|
|
|
} // Detect offset control codes and adjust cursor
|
|
|
|
|
|
} else if (this.isOffsetControlCode(char0, char1)) {
|
|
|
// Cursor position is set by indent PAC (see below) in 4-column
|
|
|
// increments, with an additional offset code of 1-3 to reach any
|
|
|
// of the 32 columns specified by CEA-608. So all we need to do
|
|
|
// here is increment the column cursor by the given offset.
|
|
|
this.column_ += char1 & 0x03; // Detect PACs (Preamble Address Codes)
|
|
|
} else if (this.isPAC(char0, char1)) {
|
|
|
// There's no logic for PAC -> row mapping, so we have to just
|
|
|
// find the row code in an array and use its index :(
|
|
|
var row = ROWS.indexOf(data & 0x1f20); // Configure the caption window if we're in roll-up mode
|
|
|
|
|
|
if (this.mode_ === 'rollUp') {
|
|
|
// This implies that the base row is incorrectly set.
|
|
|
// As per the recommendation in CEA-608(Base Row Implementation), defer to the number
|
|
|
// of roll-up rows set.
|
|
|
if (row - this.rollUpRows_ + 1 < 0) {
|
|
|
row = this.rollUpRows_ - 1;
|
|
|
}
|
|
|
|
|
|
this.setRollUp(packet.pts, row);
|
|
|
}
|
|
|
|
|
|
if (row !== this.row_) {
|
|
|
// formatting is only persistent for current row
|
|
|
this.clearFormatting(packet.pts);
|
|
|
this.row_ = row;
|
|
|
} // All PACs can apply underline, so detect and apply
|
|
|
// (All odd-numbered second bytes set underline)
|
|
|
|
|
|
|
|
|
if (char1 & 0x1 && this.formatting_.indexOf('u') === -1) {
|
|
|
this.addFormatting(packet.pts, ['u']);
|
|
|
}
|
|
|
|
|
|
if ((data & 0x10) === 0x10) {
|
|
|
// We've got an indent level code. Each successive even number
|
|
|
// increments the column cursor by 4, so we can get the desired
|
|
|
// column position by bit-shifting to the right (to get n/2)
|
|
|
// and multiplying by 4.
|
|
|
this.column_ = ((data & 0xe) >> 1) * 4;
|
|
|
}
|
|
|
|
|
|
if (this.isColorPAC(char1)) {
|
|
|
// it's a color code, though we only support white, which
|
|
|
// can be either normal or italicized. white italics can be
|
|
|
// either 0x4e or 0x6e depending on the row, so we just
|
|
|
// bitwise-and with 0xe to see if italics should be turned on
|
|
|
if ((char1 & 0xe) === 0xe) {
|
|
|
this.addFormatting(packet.pts, ['i']);
|
|
|
}
|
|
|
} // We have a normal character in char0, and possibly one in char1
|
|
|
|
|
|
} else if (this.isNormalChar(char0)) {
|
|
|
if (char1 === 0x00) {
|
|
|
char1 = null;
|
|
|
}
|
|
|
|
|
|
text = getCharFromCode(char0);
|
|
|
text += getCharFromCode(char1);
|
|
|
this[this.mode_](packet.pts, text);
|
|
|
this.column_ += text.length;
|
|
|
} // finish data processing
|
|
|
|
|
|
};
|
|
|
};
|
|
|
|
|
|
Cea608Stream.prototype = new stream(); // Trigger a cue point that captures the current state of the
|
|
|
// display buffer
|
|
|
|
|
|
Cea608Stream.prototype.flushDisplayed = function (pts) {
|
|
|
var content = this.displayed_ // remove spaces from the start and end of the string
|
|
|
.map(function (row) {
|
|
|
try {
|
|
|
return row.trim();
|
|
|
} catch (e) {
|
|
|
// Ordinarily, this shouldn't happen. However, caption
|
|
|
// parsing errors should not throw exceptions and
|
|
|
// break playback.
|
|
|
// eslint-disable-next-line no-console
|
|
|
console.error('Skipping malformed caption.');
|
|
|
return '';
|
|
|
}
|
|
|
}) // combine all text rows to display in one cue
|
|
|
.join('\n') // and remove blank rows from the start and end, but not the middle
|
|
|
.replace(/^\n+|\n+$/g, '');
|
|
|
|
|
|
if (content.length) {
|
|
|
this.trigger('data', {
|
|
|
startPts: this.startPts_,
|
|
|
endPts: pts,
|
|
|
text: content,
|
|
|
stream: this.name_
|
|
|
});
|
|
|
}
|
|
|
};
|
|
|
/**
|
|
|
* Zero out the data, used for startup and on seek
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea608Stream.prototype.reset = function () {
|
|
|
this.mode_ = 'popOn'; // When in roll-up mode, the index of the last row that will
|
|
|
// actually display captions. If a caption is shifted to a row
|
|
|
// with a lower index than this, it is cleared from the display
|
|
|
// buffer
|
|
|
|
|
|
this.topRow_ = 0;
|
|
|
this.startPts_ = 0;
|
|
|
this.displayed_ = createDisplayBuffer();
|
|
|
this.nonDisplayed_ = createDisplayBuffer();
|
|
|
this.lastControlCode_ = null; // Track row and column for proper line-breaking and spacing
|
|
|
|
|
|
this.column_ = 0;
|
|
|
this.row_ = BOTTOM_ROW;
|
|
|
this.rollUpRows_ = 2; // This variable holds currently-applied formatting
|
|
|
|
|
|
this.formatting_ = [];
|
|
|
};
|
|
|
/**
|
|
|
* Sets up control code and related constants for this instance
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea608Stream.prototype.setConstants = function () {
|
|
|
// The following attributes have these uses:
|
|
|
// ext_ : char0 for mid-row codes, and the base for extended
|
|
|
// chars (ext_+0, ext_+1, and ext_+2 are char0s for
|
|
|
// extended codes)
|
|
|
// control_: char0 for control codes, except byte-shifted to the
|
|
|
// left so that we can do this.control_ | CONTROL_CODE
|
|
|
// offset_: char0 for tab offset codes
|
|
|
//
|
|
|
// It's also worth noting that control codes, and _only_ control codes,
|
|
|
// differ between field 1 and field2. Field 2 control codes are always
|
|
|
// their field 1 value plus 1. That's why there's the "| field" on the
|
|
|
// control value.
|
|
|
if (this.dataChannel_ === 0) {
|
|
|
this.BASE_ = 0x10;
|
|
|
this.EXT_ = 0x11;
|
|
|
this.CONTROL_ = (0x14 | this.field_) << 8;
|
|
|
this.OFFSET_ = 0x17;
|
|
|
} else if (this.dataChannel_ === 1) {
|
|
|
this.BASE_ = 0x18;
|
|
|
this.EXT_ = 0x19;
|
|
|
this.CONTROL_ = (0x1c | this.field_) << 8;
|
|
|
this.OFFSET_ = 0x1f;
|
|
|
} // Constants for the LSByte command codes recognized by Cea608Stream. This
|
|
|
// list is not exhaustive. For a more comprehensive listing and semantics see
|
|
|
// http://www.gpo.gov/fdsys/pkg/CFR-2010-title47-vol1/pdf/CFR-2010-title47-vol1-sec15-119.pdf
|
|
|
// Padding
|
|
|
|
|
|
|
|
|
this.PADDING_ = 0x0000; // Pop-on Mode
|
|
|
|
|
|
this.RESUME_CAPTION_LOADING_ = this.CONTROL_ | 0x20;
|
|
|
this.END_OF_CAPTION_ = this.CONTROL_ | 0x2f; // Roll-up Mode
|
|
|
|
|
|
this.ROLL_UP_2_ROWS_ = this.CONTROL_ | 0x25;
|
|
|
this.ROLL_UP_3_ROWS_ = this.CONTROL_ | 0x26;
|
|
|
this.ROLL_UP_4_ROWS_ = this.CONTROL_ | 0x27;
|
|
|
this.CARRIAGE_RETURN_ = this.CONTROL_ | 0x2d; // paint-on mode
|
|
|
|
|
|
this.RESUME_DIRECT_CAPTIONING_ = this.CONTROL_ | 0x29; // Erasure
|
|
|
|
|
|
this.BACKSPACE_ = this.CONTROL_ | 0x21;
|
|
|
this.ERASE_DISPLAYED_MEMORY_ = this.CONTROL_ | 0x2c;
|
|
|
this.ERASE_NON_DISPLAYED_MEMORY_ = this.CONTROL_ | 0x2e;
|
|
|
};
|
|
|
/**
|
|
|
* Detects if the 2-byte packet data is a special character
|
|
|
*
|
|
|
* Special characters have a second byte in the range 0x30 to 0x3f,
|
|
|
* with the first byte being 0x11 (for data channel 1) or 0x19 (for
|
|
|
* data channel 2).
|
|
|
*
|
|
|
* @param {Integer} char0 The first byte
|
|
|
* @param {Integer} char1 The second byte
|
|
|
* @return {Boolean} Whether the 2 bytes are an special character
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea608Stream.prototype.isSpecialCharacter = function (char0, char1) {
|
|
|
return char0 === this.EXT_ && char1 >= 0x30 && char1 <= 0x3f;
|
|
|
};
|
|
|
/**
|
|
|
* Detects if the 2-byte packet data is an extended character
|
|
|
*
|
|
|
* Extended characters have a second byte in the range 0x20 to 0x3f,
|
|
|
* with the first byte being 0x12 or 0x13 (for data channel 1) or
|
|
|
* 0x1a or 0x1b (for data channel 2).
|
|
|
*
|
|
|
* @param {Integer} char0 The first byte
|
|
|
* @param {Integer} char1 The second byte
|
|
|
* @return {Boolean} Whether the 2 bytes are an extended character
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea608Stream.prototype.isExtCharacter = function (char0, char1) {
|
|
|
return (char0 === this.EXT_ + 1 || char0 === this.EXT_ + 2) && char1 >= 0x20 && char1 <= 0x3f;
|
|
|
};
|
|
|
/**
|
|
|
* Detects if the 2-byte packet is a mid-row code
|
|
|
*
|
|
|
* Mid-row codes have a second byte in the range 0x20 to 0x2f, with
|
|
|
* the first byte being 0x11 (for data channel 1) or 0x19 (for data
|
|
|
* channel 2).
|
|
|
*
|
|
|
* @param {Integer} char0 The first byte
|
|
|
* @param {Integer} char1 The second byte
|
|
|
* @return {Boolean} Whether the 2 bytes are a mid-row code
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea608Stream.prototype.isMidRowCode = function (char0, char1) {
|
|
|
return char0 === this.EXT_ && char1 >= 0x20 && char1 <= 0x2f;
|
|
|
};
|
|
|
/**
|
|
|
* Detects if the 2-byte packet is an offset control code
|
|
|
*
|
|
|
* Offset control codes have a second byte in the range 0x21 to 0x23,
|
|
|
* with the first byte being 0x17 (for data channel 1) or 0x1f (for
|
|
|
* data channel 2).
|
|
|
*
|
|
|
* @param {Integer} char0 The first byte
|
|
|
* @param {Integer} char1 The second byte
|
|
|
* @return {Boolean} Whether the 2 bytes are an offset control code
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea608Stream.prototype.isOffsetControlCode = function (char0, char1) {
|
|
|
return char0 === this.OFFSET_ && char1 >= 0x21 && char1 <= 0x23;
|
|
|
};
|
|
|
/**
|
|
|
* Detects if the 2-byte packet is a Preamble Address Code
|
|
|
*
|
|
|
* PACs have a first byte in the range 0x10 to 0x17 (for data channel 1)
|
|
|
* or 0x18 to 0x1f (for data channel 2), with the second byte in the
|
|
|
* range 0x40 to 0x7f.
|
|
|
*
|
|
|
* @param {Integer} char0 The first byte
|
|
|
* @param {Integer} char1 The second byte
|
|
|
* @return {Boolean} Whether the 2 bytes are a PAC
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea608Stream.prototype.isPAC = function (char0, char1) {
|
|
|
return char0 >= this.BASE_ && char0 < this.BASE_ + 8 && char1 >= 0x40 && char1 <= 0x7f;
|
|
|
};
|
|
|
/**
|
|
|
* Detects if a packet's second byte is in the range of a PAC color code
|
|
|
*
|
|
|
* PAC color codes have the second byte be in the range 0x40 to 0x4f, or
|
|
|
* 0x60 to 0x6f.
|
|
|
*
|
|
|
* @param {Integer} char1 The second byte
|
|
|
* @return {Boolean} Whether the byte is a color PAC
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea608Stream.prototype.isColorPAC = function (char1) {
|
|
|
return char1 >= 0x40 && char1 <= 0x4f || char1 >= 0x60 && char1 <= 0x7f;
|
|
|
};
|
|
|
/**
|
|
|
* Detects if a single byte is in the range of a normal character
|
|
|
*
|
|
|
* Normal text bytes are in the range 0x20 to 0x7f.
|
|
|
*
|
|
|
* @param {Integer} char The byte
|
|
|
* @return {Boolean} Whether the byte is a normal character
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea608Stream.prototype.isNormalChar = function (char) {
|
|
|
return char >= 0x20 && char <= 0x7f;
|
|
|
};
|
|
|
/**
|
|
|
* Configures roll-up
|
|
|
*
|
|
|
* @param {Integer} pts Current PTS
|
|
|
* @param {Integer} newBaseRow Used by PACs to slide the current window to
|
|
|
* a new position
|
|
|
*/
|
|
|
|
|
|
|
|
|
Cea608Stream.prototype.setRollUp = function (pts, newBaseRow) {
|
|
|
// Reset the base row to the bottom row when switching modes
|
|
|
if (this.mode_ !== 'rollUp') {
|
|
|
this.row_ = BOTTOM_ROW;
|
|
|
this.mode_ = 'rollUp'; // Spec says to wipe memories when switching to roll-up
|
|
|
|
|
|
this.flushDisplayed(pts);
|
|
|
this.nonDisplayed_ = createDisplayBuffer();
|
|
|
this.displayed_ = createDisplayBuffer();
|
|
|
}
|
|
|
|
|
|
if (newBaseRow !== undefined && newBaseRow !== this.row_) {
|
|
|
// move currently displayed captions (up or down) to the new base row
|
|
|
for (var i = 0; i < this.rollUpRows_; i++) {
|
|
|
this.displayed_[newBaseRow - i] = this.displayed_[this.row_ - i];
|
|
|
this.displayed_[this.row_ - i] = '';
|
|
|
}
|
|
|
}
|
|
|
|
|
|
if (newBaseRow === undefined) {
|
|
|
newBaseRow = this.row_;
|
|
|
}
|
|
|
|
|
|
this.topRow_ = newBaseRow - this.rollUpRows_ + 1;
|
|
|
}; // Adds the opening HTML tag for the passed character to the caption text,
|
|
|
// and keeps track of it for later closing
|
|
|
|
|
|
|
|
|
Cea608Stream.prototype.addFormatting = function (pts, format) {
|
|
|
this.formatting_ = this.formatting_.concat(format);
|
|
|
var text = format.reduce(function (text, format) {
|
|
|
return text + '<' + format + '>';
|
|
|
}, '');
|
|
|
this[this.mode_](pts, text);
|
|
|
}; // Adds HTML closing tags for current formatting to caption text and
|
|
|
// clears remembered formatting
|
|
|
|
|
|
|
|
|
Cea608Stream.prototype.clearFormatting = function (pts) {
|
|
|
if (!this.formatting_.length) {
|
|
|
return;
|
|
|
}
|
|
|
|
|
|
var text = this.formatting_.reverse().reduce(function (text, format) {
|
|
|
return text + '</' + format + '>';
|
|
|
}, '');
|
|
|
this.formatting_ = [];
|
|
|
this[this.mode_](pts, text);
|
|
|
}; // Mode Implementations
|
|
|
|
|
|
|
|
|
Cea608Stream.prototype.popOn = function (pts, text) {
|
|
|
var baseRow = this.nonDisplayed_[this.row_]; // buffer characters
|
|
|
|
|
|
baseRow += text;
|
|
|
this.nonDisplayed_[this.row_] = baseRow;
|
|
|
};
|
|
|
|
|
|
Cea608Stream.prototype.rollUp = function (pts, text) {
|
|
|
var baseRow = this.displayed_[this.row_];
|
|
|
baseRow += text;
|
|
|
this.displayed_[this.row_] = baseRow;
|
|
|
};
|
|
|
|
|
|
Cea608Stream.prototype.shiftRowsUp_ = function () {
|
|
|
var i; // clear out inactive rows
|
|
|
|
|
|
for (i = 0; i < this.topRow_; i++) {
|
|
|
this.displayed_[i] = '';
|
|
|
}
|
|
|
|
|
|
for (i = this.row_ + 1; i < BOTTOM_ROW + 1; i++) {
|
|
|
this.displayed_[i] = '';
|
|
|
} // shift displayed rows up
|
|
|
|
|
|
|
|
|
for (i = this.topRow_; i < this.row_; i++) {
|
|
|
this.displayed_[i] = this.displayed_[i + 1];
|
|
|
} // clear out the bottom row
|
|
|
|
|
|
|
|
|
this.displayed_[this.row_] = '';
|
|
|
};
|
|
|
|
|
|
Cea608Stream.prototype.paintOn = function (pts, text) {
|
|
|
var baseRow = this.displayed_[this.row_];
|
|
|
baseRow += text;
|
|
|
this.displayed_[this.row_] = baseRow;
|
|
|
}; // exports
|
|
|
|
|
|
|
|
|
var captionStream = {
|
|
|
CaptionStream: CaptionStream,
|
|
|
Cea608Stream: Cea608Stream,
|
|
|
Cea708Stream: Cea708Stream
|
|
|
};
|
|
|
|
|
|
/**
|
|
|
* mux.js
|
|
|
*
|
|
|
* Copyright (c) Brightcove
|
|
|
* Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
|
|
|
*/
|
|
|
|
|
|
var streamTypes = {
|
|
|
H264_STREAM_TYPE: 0x1B,
|
|
|
ADTS_STREAM_TYPE: 0x0F,
|
|
|
METADATA_STREAM_TYPE: 0x15
|
|
|
};
|
|
|
|
|
|
var MAX_TS = 8589934592;
|
|
|
var RO_THRESH = 4294967296;
|
|
|
var TYPE_SHARED = 'shared';
|
|
|
|
|
|
var handleRollover = function handleRollover(value, reference) {
|
|
|
var direction = 1;
|
|
|
|
|
|
if (value > reference) {
|
|
|
// If the current timestamp value is greater than our reference timestamp and we detect a
|
|
|
// timestamp rollover, this means the roll over is happening in the opposite direction.
|
|
|
// Example scenario: Enter a long stream/video just after a rollover occurred. The reference
|
|
|
// point will be set to a small number, e.g. 1. The user then seeks backwards over the
|
|
|
// rollover point. In loading this segment, the timestamp values will be very large,
|
|
|
// e.g. 2^33 - 1. Since this comes before the data we loaded previously, we want to adjust
|
|
|
// the time stamp to be `value - 2^33`.
|
|
|
direction = -1;
|
|
|
} // Note: A seek forwards or back that is greater than the RO_THRESH (2^32, ~13 hours) will
|
|
|
// cause an incorrect adjustment.
|
|
|
|
|
|
|
|
|
while (Math.abs(reference - value) > RO_THRESH) {
|
|
|
value += direction * MAX_TS;
|
|
|
}
|
|
|
|
|
|
return value;
|
|
|
};
|
|
|
|
|
|
var TimestampRolloverStream = function TimestampRolloverStream(type) {
|
|
|
var lastDTS, referenceDTS;
|
|
|
TimestampRolloverStream.prototype.init.call(this); // The "shared" type is used in cases where a stream will contain muxed
|
|
|
// video and audio. We could use `undefined` here, but having a string
|
|
|
// makes debugging a little clearer.
|
|
|
|
|
|
this.type_ = type || TYPE_SHARED;
|
|
|
|
|
|
this.push = function (data) {
|
|
|
// Any "shared" rollover streams will accept _all_ data. Otherwise,
|
|
|
// streams will only accept data that matches their type.
|
|
|
if (this.type_ !== TYPE_SHARED && data.type !== this.type_) {
|
|
|
return;
|
|
|
}
|
|
|
|
|
|
if (referenceDTS === undefined) {
|
|
|
referenceDTS = data.dts;
|
|
|
}
|
|
|
|
|
|
data.dts = handleRollover(data.dts, referenceDTS);
|
|
|
data.pts = handleRollover(data.pts, referenceDTS);
|
|
|
lastDTS = data.dts;
|
|
|
this.trigger('data', data);
|
|
|
};
|
|
|
|
|
|
this.flush = function () {
|
|
|
referenceDTS = lastDTS;
|
|
|
this.trigger('done');
|
|
|
};
|
|
|
|
|
|
this.endTimeline = function () {
|
|
|
this.flush();
|
|
|
this.trigger('endedtimeline');
|
|
|
};
|
|
|
|
|
|
this.discontinuity = function () {
|
|
|
referenceDTS = void 0;
|
|
|
lastDTS = void 0;
|
|
|
};
|
|
|
|
|
|
this.reset = function () {
|
|
|
this.discontinuity();
|
|
|
this.trigger('reset');
|
|
|
};
|
|
|
};
|
|
|
|
|
|
TimestampRolloverStream.prototype = new stream();
|
|
|
var timestampRolloverStream = {
|
|
|
TimestampRolloverStream: TimestampRolloverStream,
|
|
|
handleRollover: handleRollover
|
|
|
};
|
|
|
|
|
|
var percentEncode = function percentEncode(bytes, start, end) {
|
|
|
var i,
|
|
|
result = '';
|
|
|
|
|
|
for (i = start; i < end; i++) {
|
|
|
result += '%' + ('00' + bytes[i].toString(16)).slice(-2);
|
|
|
}
|
|
|
|
|
|
return result;
|
|
|
},
|
|
|
// return the string representation of the specified byte range,
|
|
|
// interpreted as UTf-8.
|
|
|
parseUtf8 = function parseUtf8(bytes, start, end) {
|
|
|
return decodeURIComponent(percentEncode(bytes, start, end));
|
|
|
},
|
|
|
// return the string representation of the specified byte range,
|
|
|
// interpreted as ISO-8859-1.
|
|
|
parseIso88591 = function parseIso88591(bytes, start, end) {
|
|
|
return unescape(percentEncode(bytes, start, end)); // jshint ignore:line
|
|
|
},
|
|
|
parseSyncSafeInteger = function parseSyncSafeInteger(data) {
|
|
|
return data[0] << 21 | data[1] << 14 | data[2] << 7 | data[3];
|
|
|
},
|
|
|
tagParsers = {
|
|
|
TXXX: function TXXX(tag) {
|
|
|
var i;
|
|
|
|
|
|
if (tag.data[0] !== 3) {
|
|
|
// ignore frames with unrecognized character encodings
|
|
|
return;
|
|
|
}
|
|
|
|
|
|
for (i = 1; i < tag.data.length; i++) {
|
|
|
if (tag.data[i] === 0) {
|
|
|
// parse the text fields
|
|
|
tag.description = parseUtf8(tag.data, 1, i); // do not include the null terminator in the tag value
|
|
|
|
|
|
tag.value = parseUtf8(tag.data, i + 1, tag.data.length).replace(/\0*$/, '');
|
|
|
break;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
tag.data = tag.value;
|
|
|
},
|
|
|
WXXX: function WXXX(tag) {
|
|
|
var i;
|
|
|
|
|
|
if (tag.data[0] !== 3) {
|
|
|
// ignore frames with unrecognized character encodings
|
|
|
return;
|
|
|
}
|
|
|
|
|
|
for (i = 1; i < tag.data.length; i++) {
|
|
|
if (tag.data[i] === 0) {
|
|
|
// parse the description and URL fields
|
|
|
tag.description = parseUtf8(tag.data, 1, i);
|
|
|
tag.url = parseUtf8(tag.data, i + 1, tag.data.length);
|
|
|
break;
|
|
|
}
|
|
|
}
|
|
|
},
|
|
|
PRIV: function PRIV(tag) {
|
|
|
var i;
|
|
|
|
|
|
for (i = 0; i < tag.data.length; i++) {
|
|
|
if (tag.data[i] === 0) {
|
|
|
// parse the description and URL fields
|
|
|
tag.owner = parseIso88591(tag.data, 0, i);
|
|
|
break;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
tag.privateData = tag.data.subarray(i + 1);
|
|
|
tag.data = tag.privateData;
|
|
|
}
|
|
|
},
|
|
|
_MetadataStream;
|
|
|
|
|
|
_MetadataStream = function MetadataStream(options) {
|
|
|
var settings = {
|
|
|
debug: !!(options && options.debug),
|
|
|
// the bytes of the program-level descriptor field in MP2T
|
|
|
// see ISO/IEC 13818-1:2013 (E), section 2.6 "Program and
|
|
|
// program element descriptors"
|
|
|
descriptor: options && options.descriptor
|
|
|
},
|
|
|
// the total size in bytes of the ID3 tag being parsed
|
|
|
tagSize = 0,
|
|
|
// tag data that is not complete enough to be parsed
|
|
|
buffer = [],
|
|
|
// the total number of bytes currently in the buffer
|
|
|
bufferSize = 0,
|
|
|
i;
|
|
|
|
|
|
_MetadataStream.prototype.init.call(this); // calculate the text track in-band metadata track dispatch type
|
|
|
// https://html.spec.whatwg.org/multipage/embedded-content.html#steps-to-expose-a-media-resource-specific-text-track
|
|
|
|
|
|
|
|
|
this.dispatchType = streamTypes.METADATA_STREAM_TYPE.toString(16);
|
|
|
|
|
|
if (settings.descriptor) {
|
|
|
for (i = 0; i < settings.descriptor.length; i++) {
|
|
|
this.dispatchType += ('00' + settings.descriptor[i].toString(16)).slice(-2);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
this.push = function (chunk) {
|
|
|
var tag, frameStart, frameSize, frame, i, frameHeader;
|
|
|
|
|
|
if (chunk.type !== 'timed-metadata') {
|
|
|
return;
|
|
|
} // if data_alignment_indicator is set in the PES header,
|
|
|
// we must have the start of a new ID3 tag. Assume anything
|
|
|
// remaining in the buffer was malformed and throw it out
|
|
|
|
|
|
|
|
|
if (chunk.dataAlignmentIndicator) {
|
|
|
bufferSize = 0;
|
|
|
buffer.length = 0;
|
|
|
} // ignore events that don't look like ID3 data
|
|
|
|
|
|
|
|
|
if (buffer.length === 0 && (chunk.data.length < 10 || chunk.data[0] !== 'I'.charCodeAt(0) || chunk.data[1] !== 'D'.charCodeAt(0) || chunk.data[2] !== '3'.charCodeAt(0))) {
|
|
|
if (settings.debug) {
|
|
|
// eslint-disable-next-line no-console
|
|
|
console.log('Skipping unrecognized metadata packet');
|
|
|
}
|
|
|
|
|
|
return;
|
|
|
} // add this chunk to the data we've collected so far
|
|
|
|
|
|
|
|
|
buffer.push(chunk);
|
|
|
bufferSize += chunk.data.byteLength; // grab the size of the entire frame from the ID3 header
|
|
|
|
|
|
if (buffer.length === 1) {
|
|
|
// the frame size is transmitted as a 28-bit integer in the
|
|
|
// last four bytes of the ID3 header.
|
|
|
// The most significant bit of each byte is dropped and the
|
|
|
// results concatenated to recover the actual value.
|
|
|
tagSize = parseSyncSafeInteger(chunk.data.subarray(6, 10)); // ID3 reports the tag size excluding the header but it's more
|
|
|
// convenient for our comparisons to include it
|
|
|
|
|
|
tagSize += 10;
|
|
|
} // if the entire frame has not arrived, wait for more data
|
|
|
|
|
|
|
|
|
if (bufferSize < tagSize) {
|
|
|
return;
|
|
|
} // collect the entire frame so it can be parsed
|
|
|
|
|
|
|
|
|
tag = {
|
|
|
data: new Uint8Array(tagSize),
|
|
|
frames: [],
|
|
|
pts: buffer[0].pts,
|
|
|
dts: buffer[0].dts
|
|
|
};
|
|
|
|
|
|
for (i = 0; i < tagSize;) {
|
|
|
tag.data.set(buffer[0].data.subarray(0, tagSize - i), i);
|
|
|
i += buffer[0].data.byteLength;
|
|
|
bufferSize -= buffer[0].data.byteLength;
|
|
|
buffer.shift();
|
|
|
} // find the start of the first frame and the end of the tag
|
|
|
|
|
|
|
|
|
frameStart = 10;
|
|
|
|
|
|
if (tag.data[5] & 0x40) {
|
|
|
// advance the frame start past the extended header
|
|
|
frameStart += 4; // header size field
|
|
|
|
|
|
frameStart += parseSyncSafeInteger(tag.data.subarray(10, 14)); // clip any padding off the end
|
|
|
|
|
|
tagSize -= parseSyncSafeInteger(tag.data.subarray(16, 20));
|
|
|
} // parse one or more ID3 frames
|
|
|
// http://id3.org/id3v2.3.0#ID3v2_frame_overview
|
|
|
|
|
|
|
|
|
do {
|
|
|
// determine the number of bytes in this frame
|
|
|
frameSize = parseSyncSafeInteger(tag.data.subarray(frameStart + 4, frameStart + 8));
|
|
|
|
|
|
if (frameSize < 1) {
|
|
|
// eslint-disable-next-line no-console
|
|
|
return console.log('Malformed ID3 frame encountered. Skipping metadata parsing.');
|
|
|
}
|
|
|
|
|
|
frameHeader = String.fromCharCode(tag.data[frameStart], tag.data[frameStart + 1], tag.data[frameStart + 2], tag.data[frameStart + 3]);
|
|
|
frame = {
|
|
|
id: frameHeader,
|
|
|
data: tag.data.subarray(frameStart + 10, frameStart + frameSize + 10)
|
|
|
};
|
|
|
frame.key = frame.id;
|
|
|
|
|
|
if (tagParsers[frame.id]) {
|
|
|
tagParsers[frame.id](frame); // handle the special PRIV frame used to indicate the start
|
|
|
// time for raw AAC data
|
|
|
|
|
|
if (frame.owner === 'com.apple.streaming.transportStreamTimestamp') {
|
|
|
var d = frame.data,
|
|
|
size = (d[3] & 0x01) << 30 | d[4] << 22 | d[5] << 14 | d[6] << 6 | d[7] >>> 2;
|
|
|
size *= 4;
|
|
|
size += d[7] & 0x03;
|
|
|
frame.timeStamp = size; // in raw AAC, all subsequent data will be timestamped based
|
|
|
// on the value of this frame
|
|
|
// we couldn't have known the appropriate pts and dts before
|
|
|
// parsing this ID3 tag so set those values now
|
|
|
|
|
|
if (tag.pts === undefined && tag.dts === undefined) {
|
|
|
tag.pts = frame.timeStamp;
|
|
|
tag.dts = frame.timeStamp;
|
|
|
}
|
|
|
|
|
|
this.trigger('timestamp', frame);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
tag.frames.push(frame);
|
|
|
frameStart += 10; // advance past the frame header
|
|
|
|
|
|
frameStart += frameSize; // advance past the frame body
|
|
|
} while (frameStart < tagSize);
|
|
|
|
|
|
this.trigger('data', tag);
|
|
|
};
|
|
|
};
|
|
|
|
|
|
_MetadataStream.prototype = new stream();
|
|
|
var metadataStream = _MetadataStream;
|
|
|
|
|
|
var TimestampRolloverStream$1 = timestampRolloverStream.TimestampRolloverStream; // object types
|
|
|
|
|
|
var _TransportPacketStream, _TransportParseStream, _ElementaryStream; // constants
|
|
|
|
|
|
|
|
|
var MP2T_PACKET_LENGTH = 188,
|
|
|
// bytes
|
|
|
SYNC_BYTE = 0x47;
|
|
|
/**
|
|
|
* Splits an incoming stream of binary data into MPEG-2 Transport
|
|
|
* Stream packets.
|
|
|
*/
|
|
|
|
|
|
_TransportPacketStream = function TransportPacketStream() {
|
|
|
var buffer = new Uint8Array(MP2T_PACKET_LENGTH),
|
|
|
bytesInBuffer = 0;
|
|
|
|
|
|
_TransportPacketStream.prototype.init.call(this); // Deliver new bytes to the stream.
|
|
|
|
|
|
/**
|
|
|
* Split a stream of data into M2TS packets
|
|
|
**/
|
|
|
|
|
|
|
|
|
this.push = function (bytes) {
|
|
|
var startIndex = 0,
|
|
|
endIndex = MP2T_PACKET_LENGTH,
|
|
|
everything; // If there are bytes remaining from the last segment, prepend them to the
|
|
|
// bytes that were pushed in
|
|
|
|
|
|
if (bytesInBuffer) {
|
|
|
everything = new Uint8Array(bytes.byteLength + bytesInBuffer);
|
|
|
everything.set(buffer.subarray(0, bytesInBuffer));
|
|
|
everything.set(bytes, bytesInBuffer);
|
|
|
bytesInBuffer = 0;
|
|
|
} else {
|
|
|
everything = bytes;
|
|
|
} // While we have enough data for a packet
|
|
|
|
|
|
|
|
|
while (endIndex < everything.byteLength) {
|
|
|
// Look for a pair of start and end sync bytes in the data..
|
|
|
if (everything[startIndex] === SYNC_BYTE && everything[endIndex] === SYNC_BYTE) {
|
|
|
// We found a packet so emit it and jump one whole packet forward in
|
|
|
// the stream
|
|
|
this.trigger('data', everything.subarray(startIndex, endIndex));
|
|
|
startIndex += MP2T_PACKET_LENGTH;
|
|
|
endIndex += MP2T_PACKET_LENGTH;
|
|
|
continue;
|
|
|
} // If we get here, we have somehow become de-synchronized and we need to step
|
|
|
// forward one byte at a time until we find a pair of sync bytes that denote
|
|
|
// a packet
|
|
|
|
|
|
|
|
|
startIndex++;
|
|
|
endIndex++;
|
|
|
} // If there was some data left over at the end of the segment that couldn't
|
|
|
// possibly be a whole packet, keep it because it might be the start of a packet
|
|
|
// that continues in the next segment
|
|
|
|
|
|
|
|
|
if (startIndex < everything.byteLength) {
|
|
|
buffer.set(everything.subarray(startIndex), 0);
|
|
|
bytesInBuffer = everything.byteLength - startIndex;
|
|
|
}
|
|
|
};
|
|
|
/**
|
|
|
* Passes identified M2TS packets to the TransportParseStream to be parsed
|
|
|
**/
|
|
|
|
|
|
|
|
|
this.flush = function () {
|
|
|
// If the buffer contains a whole packet when we are being flushed, emit it
|
|
|
// and empty the buffer. Otherwise hold onto the data because it may be
|
|
|
// important for decoding the next segment
|
|
|
if (bytesInBuffer === MP2T_PACKET_LENGTH && buffer[0] === SYNC_BYTE) {
|
|
|
this.trigger('data', buffer);
|
|
|
bytesInBuffer = 0;
|
|
|
}
|
|
|
|
|
|
this.trigger('done');
|
|
|
};
|
|
|
|
|
|
this.endTimeline = function () {
|
|
|
this.flush();
|
|
|
this.trigger('endedtimeline');
|
|
|
};
|
|
|
|
|
|
this.reset = function () {
|
|
|
bytesInBuffer = 0;
|
|
|
this.trigger('reset');
|
|
|
};
|
|
|
};
|
|
|
|
|
|
_TransportPacketStream.prototype = new stream();
|
|
|
/**
|
|
|
* Accepts an MP2T TransportPacketStream and emits data events with parsed
|
|
|
* forms of the individual transport stream packets.
|
|
|
*/
|
|
|
|
|
|
_TransportParseStream = function TransportParseStream() {
|
|
|
var parsePsi, parsePat, parsePmt, self;
|
|
|
|
|
|
_TransportParseStream.prototype.init.call(this);
|
|
|
|
|
|
self = this;
|
|
|
this.packetsWaitingForPmt = [];
|
|
|
this.programMapTable = undefined;
|
|
|
|
|
|
parsePsi = function parsePsi(payload, psi) {
|
|
|
var offset = 0; // PSI packets may be split into multiple sections and those
|
|
|
// sections may be split into multiple packets. If a PSI
|
|
|
// section starts in this packet, the payload_unit_start_indicator
|
|
|
// will be true and the first byte of the payload will indicate
|
|
|
// the offset from the current position to the start of the
|
|
|
// section.
|
|
|
|
|
|
if (psi.payloadUnitStartIndicator) {
|
|
|
offset += payload[offset] + 1;
|
|
|
}
|
|
|
|
|
|
if (psi.type === 'pat') {
|
|
|
parsePat(payload.subarray(offset), psi);
|
|
|
} else {
|
|
|
parsePmt(payload.subarray(offset), psi);
|
|
|
}
|
|
|
};
|
|
|
|
|
|
parsePat = function parsePat(payload, pat) {
|
|
|
pat.section_number = payload[7]; // eslint-disable-line camelcase
|
|
|
|
|
|
pat.last_section_number = payload[8]; // eslint-disable-line camelcase
|
|
|
// skip the PSI header and parse the first PMT entry
|
|
|
|
|
|
self.pmtPid = (payload[10] & 0x1F) << 8 | payload[11];
|
|
|
pat.pmtPid = self.pmtPid;
|
|
|
};
|
|
|
/**
|
|
|
* Parse out the relevant fields of a Program Map Table (PMT).
|
|
|
* @param payload {Uint8Array} the PMT-specific portion of an MP2T
|
|
|
* packet. The first byte in this array should be the table_id
|
|
|
* field.
|
|
|
* @param pmt {object} the object that should be decorated with
|
|
|
* fields parsed from the PMT.
|
|
|
*/
|
|
|
|
|
|
|
|
|
parsePmt = function parsePmt(payload, pmt) {
|
|
|
var sectionLength, tableEnd, programInfoLength, offset; // PMTs can be sent ahead of the time when they should actually
|
|
|
// take effect. We don't believe this should ever be the case
|
|
|
// for HLS but we'll ignore "forward" PMT declarations if we see
|
|
|
// them. Future PMT declarations have the current_next_indicator
|
|
|
// set to zero.
|
|
|
|
|
|
if (!(payload[5] & 0x01)) {
|
|
|
return;
|
|
|
} // overwrite any existing program map table
|
|
|
|
|
|
|
|
|
self.programMapTable = {
|
|
|
video: null,
|
|
|
audio: null,
|
|
|
'timed-metadata': {}
|
|
|
}; // the mapping table ends at the end of the current section
|
|
|
|
|
|
sectionLength = (payload[1] & 0x0f) << 8 | payload[2];
|
|
|
tableEnd = 3 + sectionLength - 4; // to determine where the table is, we have to figure out how
|
|
|
// long the program info descriptors are
|
|
|
|
|
|
programInfoLength = (payload[10] & 0x0f) << 8 | payload[11]; // advance the offset to the first entry in the mapping table
|
|
|
|
|
|
offset = 12 + programInfoLength;
|
|
|
|
|
|
while (offset < tableEnd) {
|
|
|
var streamType = payload[offset];
|
|
|
var pid = (payload[offset + 1] & 0x1F) << 8 | payload[offset + 2]; // only map a single elementary_pid for audio and video stream types
|
|
|
// TODO: should this be done for metadata too? for now maintain behavior of
|
|
|
// multiple metadata streams
|
|
|
|
|
|
if (streamType === streamTypes.H264_STREAM_TYPE && self.programMapTable.video === null) {
|
|
|
self.programMapTable.video = pid;
|
|
|
} else if (streamType === streamTypes.ADTS_STREAM_TYPE && self.programMapTable.audio === null) {
|
|
|
self.programMapTable.audio = pid;
|
|
|
} else if (streamType === streamTypes.METADATA_STREAM_TYPE) {
|
|
|
// map pid to stream type for metadata streams
|
|
|
self.programMapTable['timed-metadata'][pid] = streamType;
|
|
|
} // move to the next table entry
|
|
|
// skip past the elementary stream descriptors, if present
|
|
|
|
|
|
|
|
|
offset += ((payload[offset + 3] & 0x0F) << 8 | payload[offset + 4]) + 5;
|
|
|
} // record the map on the packet as well
|
|
|
|
|
|
|
|
|
pmt.programMapTable = self.programMapTable;
|
|
|
};
|
|
|
/**
|
|
|
* Deliver a new MP2T packet to the next stream in the pipeline.
|
|
|
*/
|
|
|
|
|
|
|
|
|
this.push = function (packet) {
|
|
|
var result = {},
|
|
|
offset = 4;
|
|
|
result.payloadUnitStartIndicator = !!(packet[1] & 0x40); // pid is a 13-bit field starting at the last bit of packet[1]
|
|
|
|
|
|
result.pid = packet[1] & 0x1f;
|
|
|
result.pid <<= 8;
|
|
|
result.pid |= packet[2]; // if an adaption field is present, its length is specified by the
|
|
|
// fifth byte of the TS packet header. The adaptation field is
|
|
|
// used to add stuffing to PES packets that don't fill a complete
|
|
|
// TS packet, and to specify some forms of timing and control data
|
|
|
// that we do not currently use.
|
|
|
|
|
|
if ((packet[3] & 0x30) >>> 4 > 0x01) {
|
|
|
offset += packet[offset] + 1;
|
|
|
} // parse the rest of the packet based on the type
|
|
|
|
|
|
|
|
|
if (result.pid === 0) {
|
|
|
result.type = 'pat';
|
|
|
parsePsi(packet.subarray(offset), result);
|
|
|
this.trigger('data', result);
|
|
|
} else if (result.pid === this.pmtPid) {
|
|
|
result.type = 'pmt';
|
|
|
parsePsi(packet.subarray(offset), result);
|
|
|
this.trigger('data', result); // if there are any packets waiting for a PMT to be found, process them now
|
|
|
|
|
|
while (this.packetsWaitingForPmt.length) {
|
|
|
this.processPes_.apply(this, this.packetsWaitingForPmt.shift());
|
|
|
}
|
|
|
} else if (this.programMapTable === undefined) {
|
|
|
// When we have not seen a PMT yet, defer further processing of
|
|
|
// PES packets until one has been parsed
|
|
|
this.packetsWaitingForPmt.push([packet, offset, result]);
|
|
|
} else {
|
|
|
this.processPes_(packet, offset, result);
|
|
|
}
|
|
|
};
|
|
|
|
|
|
this.processPes_ = function (packet, offset, result) {
|
|
|
// set the appropriate stream type
|
|
|
if (result.pid === this.programMapTable.video) {
|
|
|
result.streamType = streamTypes.H264_STREAM_TYPE;
|
|
|
} else if (result.pid === this.programMapTable.audio) {
|
|
|
result.streamType = streamTypes.ADTS_STREAM_TYPE;
|
|
|
} else {
|
|
|
// if not video or audio, it is timed-metadata or unknown
|
|
|
// if unknown, streamType will be undefined
|
|
|
result.streamType = this.programMapTable['timed-metadata'][result.pid];
|
|
|
}
|
|
|
|
|
|
result.type = 'pes';
|
|
|
result.data = packet.subarray(offset);
|
|
|
this.trigger('data', result);
|
|
|
};
|
|
|
};
|
|
|
|
|
|
_TransportParseStream.prototype = new stream();
|
|
|
_TransportParseStream.STREAM_TYPES = {
|
|
|
h264: 0x1b,
|
|
|
adts: 0x0f
|
|
|
};
|
|
|
/**
|
|
|
* Reconsistutes program elementary stream (PES) packets from parsed
|
|
|
* transport stream packets. That is, if you pipe an
|
|
|
* mp2t.TransportParseStream into a mp2t.ElementaryStream, the output
|
|
|
* events will be events which capture the bytes for individual PES
|
|
|
* packets plus relevant metadata that has been extracted from the
|
|
|
* container.
|
|
|
*/
|
|
|
|
|
|
_ElementaryStream = function ElementaryStream() {
|
|
|
var self = this,
|
|
|
// PES packet fragments
|
|
|
video = {
|
|
|
data: [],
|
|
|
size: 0
|
|
|
},
|
|
|
audio = {
|
|
|
data: [],
|
|
|
size: 0
|
|
|
},
|
|
|
timedMetadata = {
|
|
|
data: [],
|
|
|
size: 0
|
|
|
},
|
|
|
programMapTable,
|
|
|
parsePes = function parsePes(payload, pes) {
|
|
|
var ptsDtsFlags;
|
|
|
var startPrefix = payload[0] << 16 | payload[1] << 8 | payload[2]; // default to an empty array
|
|
|
|
|
|
pes.data = new Uint8Array(); // In certain live streams, the start of a TS fragment has ts packets
|
|
|
// that are frame data that is continuing from the previous fragment. This
|
|
|
// is to check that the pes data is the start of a new pes payload
|
|
|
|
|
|
if (startPrefix !== 1) {
|
|
|
return;
|
|
|
} // get the packet length, this will be 0 for video
|
|
|
|
|
|
|
|
|
pes.packetLength = 6 + (payload[4] << 8 | payload[5]); // find out if this packets starts a new keyframe
|
|
|
|
|
|
pes.dataAlignmentIndicator = (payload[6] & 0x04) !== 0; // PES packets may be annotated with a PTS value, or a PTS value
|
|
|
// and a DTS value. Determine what combination of values is
|
|
|
// available to work with.
|
|
|
|
|
|
ptsDtsFlags = payload[7]; // PTS and DTS are normally stored as a 33-bit number. Javascript
|
|
|
// performs all bitwise operations on 32-bit integers but javascript
|
|
|
// supports a much greater range (52-bits) of integer using standard
|
|
|
// mathematical operations.
|
|
|
// We construct a 31-bit value using bitwise operators over the 31
|
|
|
// most significant bits and then multiply by 4 (equal to a left-shift
|
|
|
// of 2) before we add the final 2 least significant bits of the
|
|
|
// timestamp (equal to an OR.)
|
|
|
|
|
|
if (ptsDtsFlags & 0xC0) {
|
|
|
// the PTS and DTS are not written out directly. For information
|
|
|
// on how they are encoded, see
|
|
|
// http://dvd.sourceforge.net/dvdinfo/pes-hdr.html
|
|
|
pes.pts = (payload[9] & 0x0E) << 27 | (payload[10] & 0xFF) << 20 | (payload[11] & 0xFE) << 12 | (payload[12] & 0xFF) << 5 | (payload[13] & 0xFE) >>> 3;
|
|
|
pes.pts *= 4; // Left shift by 2
|
|
|
|
|
|
pes.pts += (payload[13] & 0x06) >>> 1; // OR by the two LSBs
|
|
|
|
|
|
pes.dts = pes.pts;
|
|
|
|
|
|
if (ptsDtsFlags & 0x40) {
|
|
|
pes.dts = (payload[14] & 0x0E) << 27 | (payload[15] & 0xFF) << 20 | (payload[16] & 0xFE) << 12 | (payload[17] & 0xFF) << 5 | (payload[18] & 0xFE) >>> 3;
|
|
|
pes.dts *= 4; // Left shift by 2
|
|
|
|
|
|
pes.dts += (payload[18] & 0x06) >>> 1; // OR by the two LSBs
|
|
|
}
|
|
|
} // the data section starts immediately after the PES header.
|
|
|
// pes_header_data_length specifies the number of header bytes
|
|
|
// that follow the last byte of the field.
|
|
|
|
|
|
|
|
|
pes.data = payload.subarray(9 + payload[8]);
|
|
|
},
|
|
|
|
|
|
/**
|
|
|
* Pass completely parsed PES packets to the next stream in the pipeline
|
|
|
**/
|
|
|
flushStream = function flushStream(stream, type, forceFlush) {
|
|
|
var packetData = new Uint8Array(stream.size),
|
|
|
event = {
|
|
|
type: type
|
|
|
},
|
|
|
i = 0,
|
|
|
offset = 0,
|
|
|
packetFlushable = false,
|
|
|
fragment; // do nothing if there is not enough buffered data for a complete
|
|
|
// PES header
|
|
|
|
|
|
if (!stream.data.length || stream.size < 9) {
|
|
|
return;
|
|
|
}
|
|
|
|
|
|
event.trackId = stream.data[0].pid; // reassemble the packet
|
|
|
|
|
|
for (i = 0; i < stream.data.length; i++) {
|
|
|
fragment = stream.data[i];
|
|
|
packetData.set(fragment.data, offset);
|
|
|
offset += fragment.data.byteLength;
|
|
|
} // parse assembled packet's PES header
|
|
|
|
|
|
|
|
|
parsePes(packetData, event); // non-video PES packets MUST have a non-zero PES_packet_length
|
|
|
// check that there is enough stream data to fill the packet
|
|
|
|
|
|
packetFlushable = type === 'video' || event.packetLength <= stream.size; // flush pending packets if the conditions are right
|
|
|
|
|
|
if (forceFlush || packetFlushable) {
|
|
|
stream.size = 0;
|
|
|
stream.data.length = 0;
|
|
|
} // only emit packets that are complete. this is to avoid assembling
|
|
|
// incomplete PES packets due to poor segmentation
|
|
|
|
|
|
|
|
|
if (packetFlushable) {
|
|
|
self.trigger('data', event);
|
|
|
}
|
|
|
};
|
|
|
|
|
|
_ElementaryStream.prototype.init.call(this);
|
|
|
/**
|
|
|
* Identifies M2TS packet types and parses PES packets using metadata
|
|
|
* parsed from the PMT
|
|
|
**/
|
|
|
|
|
|
|
|
|
this.push = function (data) {
|
|
|
({
|
|
|
pat: function pat() {// we have to wait for the PMT to arrive as well before we
|
|
|
// have any meaningful metadata
|
|
|
},
|
|
|
pes: function pes() {
|
|
|
var stream, streamType;
|
|
|
|
|
|
switch (data.streamType) {
|
|
|
case streamTypes.H264_STREAM_TYPE:
|
|
|
stream = video;
|
|
|
streamType = 'video';
|
|
|
break;
|
|
|
|
|
|
case streamTypes.ADTS_STREAM_TYPE:
|
|
|
stream = audio;
|
|
|
streamType = 'audio';
|
|
|
break;
|
|
|
|
|
|
case streamTypes.METADATA_STREAM_TYPE:
|
|
|
stream = timedMetadata;
|
|
|
streamType = 'timed-metadata';
|
|
|
break;
|
|
|
|
|
|
default:
|
|
|
// ignore unknown stream types
|
|
|
return;
|
|
|
} // if a new packet is starting, we can flush the completed
|
|
|
// packet
|
|
|
|
|
|
|
|
|
if (data.payloadUnitStartIndicator) {
|
|
|
flushStream(stream, streamType, true);
|
|
|
} // buffer this fragment until we are sure we've received the
|
|
|
// complete payload
|
|
|
|
|
|
|
|
|
stream.data.push(data);
|
|
|
stream.size += data.data.byteLength;
|
|
|
},
|
|
|
pmt: function pmt() {
|
|
|
var event = {
|
|
|
type: 'metadata',
|
|
|
tracks: []
|
|
|
};
|
|
|
programMapTable = data.programMapTable; // translate audio and video streams to tracks
|
|
|
|
|
|
if (programMapTable.video !== null) {
|
|
|
event.tracks.push({
|
|
|
timelineStartInfo: {
|
|
|
baseMediaDecodeTime: 0
|
|
|
},
|
|
|
id: +programMapTable.video,
|
|
|
codec: 'avc',
|
|
|
type: 'video'
|
|
|
});
|
|
|
}
|
|
|
|
|
|
if (programMapTable.audio !== null) {
|
|
|
event.tracks.push({
|
|
|
timelineStartInfo: {
|
|
|
baseMediaDecodeTime: 0
|
|
|
},
|
|
|
id: +programMapTable.audio,
|
|
|
codec: 'adts',
|
|
|
type: 'audio'
|
|
|
});
|
|
|
}
|
|
|
|
|
|
self.trigger('data', event);
|
|
|
}
|
|
|
})[data.type]();
|
|
|
};
|
|
|
|
|
|
this.reset = function () {
|
|
|
video.size = 0;
|
|
|
video.data.length = 0;
|
|
|
audio.size = 0;
|
|
|
audio.data.length = 0;
|
|
|
this.trigger('reset');
|
|
|
};
|
|
|
/**
|
|
|
* Flush any remaining input. Video PES packets may be of variable
|
|
|
* length. Normally, the start of a new video packet can trigger the
|
|
|
* finalization of the previous packet. That is not possible if no
|
|
|
* more video is forthcoming, however. In that case, some other
|
|
|
* mechanism (like the end of the file) has to be employed. When it is
|
|
|
* clear that no additional data is forthcoming, calling this method
|
|
|
* will flush the buffered packets.
|
|
|
*/
|
|
|
|
|
|
|
|
|
this.flushStreams_ = function () {
|
|
|
// !!THIS ORDER IS IMPORTANT!!
|
|
|
// video first then audio
|
|
|
flushStream(video, 'video');
|
|
|
flushStream(audio, 'audio');
|
|
|
flushStream(timedMetadata, 'timed-metadata');
|
|
|
};
|
|
|
|
|
|
this.flush = function () {
|
|
|
this.flushStreams_();
|
|
|
this.trigger('done');
|
|
|
};
|
|
|
};
|
|
|
|
|
|
_ElementaryStream.prototype = new stream();
|
|
|
var m2ts = {
|
|
|
PAT_PID: 0x0000,
|
|
|
MP2T_PACKET_LENGTH: MP2T_PACKET_LENGTH,
|
|
|
TransportPacketStream: _TransportPacketStream,
|
|
|
TransportParseStream: _TransportParseStream,
|
|
|
ElementaryStream: _ElementaryStream,
|
|
|
TimestampRolloverStream: TimestampRolloverStream$1,
|
|
|
CaptionStream: captionStream.CaptionStream,
|
|
|
Cea608Stream: captionStream.Cea608Stream,
|
|
|
Cea708Stream: captionStream.Cea708Stream,
|
|
|
MetadataStream: metadataStream
|
|
|
};
|
|
|
|
|
|
for (var type in streamTypes) {
|
|
|
if (streamTypes.hasOwnProperty(type)) {
|
|
|
m2ts[type] = streamTypes[type];
|
|
|
}
|
|
|
}
|
|
|
|
|
|
var m2ts_1 = m2ts;
|
|
|
|
|
|
/**
|
|
|
* mux.js
|
|
|
*
|
|
|
* Copyright (c) Brightcove
|
|
|
* Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
|
|
|
*/
|
|
|
var ONE_SECOND_IN_TS = 90000,
|
|
|
// 90kHz clock
|
|
|
secondsToVideoTs,
|
|
|
secondsToAudioTs,
|
|
|
videoTsToSeconds,
|
|
|
audioTsToSeconds,
|
|
|
audioTsToVideoTs,
|
|
|
videoTsToAudioTs,
|
|
|
metadataTsToSeconds;
|
|
|
|
|
|
secondsToVideoTs = function secondsToVideoTs(seconds) {
|
|
|
return seconds * ONE_SECOND_IN_TS;
|
|
|
};
|
|
|
|
|
|
secondsToAudioTs = function secondsToAudioTs(seconds, sampleRate) {
|
|
|
return seconds * sampleRate;
|
|
|
};
|
|
|
|
|
|
videoTsToSeconds = function videoTsToSeconds(timestamp) {
|
|
|
return timestamp / ONE_SECOND_IN_TS;
|
|
|
};
|
|
|
|
|
|
audioTsToSeconds = function audioTsToSeconds(timestamp, sampleRate) {
|
|
|
return timestamp / sampleRate;
|
|
|
};
|
|
|
|
|
|
audioTsToVideoTs = function audioTsToVideoTs(timestamp, sampleRate) {
|
|
|
return secondsToVideoTs(audioTsToSeconds(timestamp, sampleRate));
|
|
|
};
|
|
|
|
|
|
videoTsToAudioTs = function videoTsToAudioTs(timestamp, sampleRate) {
|
|
|
return secondsToAudioTs(videoTsToSeconds(timestamp), sampleRate);
|
|
|
};
|
|
|
/**
|
|
|
* Adjust ID3 tag or caption timing information by the timeline pts values
|
|
|
* (if keepOriginalTimestamps is false) and convert to seconds
|
|
|
*/
|
|
|
|
|
|
|
|
|
metadataTsToSeconds = function metadataTsToSeconds(timestamp, timelineStartPts, keepOriginalTimestamps) {
|
|
|
return videoTsToSeconds(keepOriginalTimestamps ? timestamp : timestamp - timelineStartPts);
|
|
|
};
|
|
|
|
|
|
var clock = {
|
|
|
ONE_SECOND_IN_TS: ONE_SECOND_IN_TS,
|
|
|
secondsToVideoTs: secondsToVideoTs,
|
|
|
secondsToAudioTs: secondsToAudioTs,
|
|
|
videoTsToSeconds: videoTsToSeconds,
|
|
|
audioTsToSeconds: audioTsToSeconds,
|
|
|
audioTsToVideoTs: audioTsToVideoTs,
|
|
|
videoTsToAudioTs: videoTsToAudioTs,
|
|
|
metadataTsToSeconds: metadataTsToSeconds
|
|
|
};
|
|
|
|
|
|
var ONE_SECOND_IN_TS$1 = clock.ONE_SECOND_IN_TS;
|
|
|
|
|
|
var _AdtsStream;
|
|
|
|
|
|
var ADTS_SAMPLING_FREQUENCIES = [96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050, 16000, 12000, 11025, 8000, 7350];
|
|
|
/*
|
|
|
* Accepts a ElementaryStream and emits data events with parsed
|
|
|
* AAC Audio Frames of the individual packets. Input audio in ADTS
|
|
|
* format is unpacked and re-emitted as AAC frames.
|
|
|
*
|
|
|
* @see http://wiki.multimedia.cx/index.php?title=ADTS
|
|
|
* @see http://wiki.multimedia.cx/?title=Understanding_AAC
|
|
|
*/
|
|
|
|
|
|
_AdtsStream = function AdtsStream(handlePartialSegments) {
|
|
|
var buffer,
|
|
|
frameNum = 0;
|
|
|
|
|
|
_AdtsStream.prototype.init.call(this);
|
|
|
|
|
|
this.push = function (packet) {
|
|
|
var i = 0,
|
|
|
frameLength,
|
|
|
protectionSkipBytes,
|
|
|
frameEnd,
|
|
|
oldBuffer,
|
|
|
sampleCount,
|
|
|
adtsFrameDuration;
|
|
|
|
|
|
if (!handlePartialSegments) {
|
|
|
frameNum = 0;
|
|
|
}
|
|
|
|
|
|
if (packet.type !== 'audio') {
|
|
|
// ignore non-audio data
|
|
|
return;
|
|
|
} // Prepend any data in the buffer to the input data so that we can parse
|
|
|
// aac frames the cross a PES packet boundary
|
|
|
|
|
|
|
|
|
if (buffer) {
|
|
|
oldBuffer = buffer;
|
|
|
buffer = new Uint8Array(oldBuffer.byteLength + packet.data.byteLength);
|
|
|
buffer.set(oldBuffer);
|
|
|
buffer.set(packet.data, oldBuffer.byteLength);
|
|
|
} else {
|
|
|
buffer = packet.data;
|
|
|
} // unpack any ADTS frames which have been fully received
|
|
|
// for details on the ADTS header, see http://wiki.multimedia.cx/index.php?title=ADTS
|
|
|
|
|
|
|
|
|
while (i + 5 < buffer.length) {
|
|
|
// Look for the start of an ADTS header..
|
|
|
if (buffer[i] !== 0xFF || (buffer[i + 1] & 0xF6) !== 0xF0) {
|
|
|
// If a valid header was not found, jump one forward and attempt to
|
|
|
// find a valid ADTS header starting at the next byte
|
|
|
i++;
|
|
|
continue;
|
|
|
} // The protection skip bit tells us if we have 2 bytes of CRC data at the
|
|
|
// end of the ADTS header
|
|
|
|
|
|
|
|
|
protectionSkipBytes = (~buffer[i + 1] & 0x01) * 2; // Frame length is a 13 bit integer starting 16 bits from the
|
|
|
// end of the sync sequence
|
|
|
|
|
|
frameLength = (buffer[i + 3] & 0x03) << 11 | buffer[i + 4] << 3 | (buffer[i + 5] & 0xe0) >> 5;
|
|
|
sampleCount = ((buffer[i + 6] & 0x03) + 1) * 1024;
|
|
|
adtsFrameDuration = sampleCount * ONE_SECOND_IN_TS$1 / ADTS_SAMPLING_FREQUENCIES[(buffer[i + 2] & 0x3c) >>> 2];
|
|
|
frameEnd = i + frameLength; // If we don't have enough data to actually finish this ADTS frame, return
|
|
|
// and wait for more data
|
|
|
|
|
|
if (buffer.byteLength < frameEnd) {
|
|
|
return;
|
|
|
} // Otherwise, deliver the complete AAC frame
|
|
|
|
|
|
|
|
|
this.trigger('data', {
|
|
|
pts: packet.pts + frameNum * adtsFrameDuration,
|
|
|
dts: packet.dts + frameNum * adtsFrameDuration,
|
|
|
sampleCount: sampleCount,
|
|
|
audioobjecttype: (buffer[i + 2] >>> 6 & 0x03) + 1,
|
|
|
channelcount: (buffer[i + 2] & 1) << 2 | (buffer[i + 3] & 0xc0) >>> 6,
|
|
|
samplerate: ADTS_SAMPLING_FREQUENCIES[(buffer[i + 2] & 0x3c) >>> 2],
|
|
|
samplingfrequencyindex: (buffer[i + 2] & 0x3c) >>> 2,
|
|
|
// assume ISO/IEC 14496-12 AudioSampleEntry default of 16
|
|
|
samplesize: 16,
|
|
|
data: buffer.subarray(i + 7 + protectionSkipBytes, frameEnd)
|
|
|
});
|
|
|
frameNum++; // If the buffer is empty, clear it and return
|
|
|
|
|
|
if (buffer.byteLength === frameEnd) {
|
|
|
buffer = undefined;
|
|
|
return;
|
|
|
} // Remove the finished frame from the buffer and start the process again
|
|
|
|
|
|
|
|
|
buffer = buffer.subarray(frameEnd);
|
|
|
}
|
|
|
};
|
|
|
|
|
|
this.flush = function () {
|
|
|
frameNum = 0;
|
|
|
this.trigger('done');
|
|
|
};
|
|
|
|
|
|
this.reset = function () {
|
|
|
buffer = void 0;
|
|
|
this.trigger('reset');
|
|
|
};
|
|
|
|
|
|
this.endTimeline = function () {
|
|
|
buffer = void 0;
|
|
|
this.trigger('endedtimeline');
|
|
|
};
|
|
|
};
|
|
|
|
|
|
_AdtsStream.prototype = new stream();
|
|
|
var adts = _AdtsStream;
|
|
|
|
|
|
/**
|
|
|
* mux.js
|
|
|
*
|
|
|
* Copyright (c) Brightcove
|
|
|
* Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
|
|
|
*/
|
|
|
|
|
|
var ExpGolomb;
|
|
|
/**
|
|
|
* Parser for exponential Golomb codes, a variable-bitwidth number encoding
|
|
|
* scheme used by h264.
|
|
|
*/
|
|
|
|
|
|
ExpGolomb = function ExpGolomb(workingData) {
|
|
|
var // the number of bytes left to examine in workingData
|
|
|
workingBytesAvailable = workingData.byteLength,
|
|
|
// the current word being examined
|
|
|
workingWord = 0,
|
|
|
// :uint
|
|
|
// the number of bits left to examine in the current word
|
|
|
workingBitsAvailable = 0; // :uint;
|
|
|
// ():uint
|
|
|
|
|
|
this.length = function () {
|
|
|
return 8 * workingBytesAvailable;
|
|
|
}; // ():uint
|
|
|
|
|
|
|
|
|
this.bitsAvailable = function () {
|
|
|
return 8 * workingBytesAvailable + workingBitsAvailable;
|
|
|
}; // ():void
|
|
|
|
|
|
|
|
|
this.loadWord = function () {
|
|
|
var position = workingData.byteLength - workingBytesAvailable,
|
|
|
workingBytes = new Uint8Array(4),
|
|
|
availableBytes = Math.min(4, workingBytesAvailable);
|
|
|
|
|
|
if (availableBytes === 0) {
|
|
|
throw new Error('no bytes available');
|
|
|
}
|
|
|
|
|
|
workingBytes.set(workingData.subarray(position, position + availableBytes));
|
|
|
workingWord = new DataView(workingBytes.buffer).getUint32(0); // track the amount of workingData that has been processed
|
|
|
|
|
|
workingBitsAvailable = availableBytes * 8;
|
|
|
workingBytesAvailable -= availableBytes;
|
|
|
}; // (count:int):void
|
|
|
|
|
|
|
|
|
this.skipBits = function (count) {
|
|
|
var skipBytes; // :int
|
|
|
|
|
|
if (workingBitsAvailable > count) {
|
|
|
workingWord <<= count;
|
|
|
workingBitsAvailable -= count;
|
|
|
} else {
|
|
|
count -= workingBitsAvailable;
|
|
|
skipBytes = Math.floor(count / 8);
|
|
|
count -= skipBytes * 8;
|
|
|
workingBytesAvailable -= skipBytes;
|
|
|
this.loadWord();
|
|
|
workingWord <<= count;
|
|
|
workingBitsAvailable -= count;
|
|
|
}
|
|
|
}; // (size:int):uint
|
|
|
|
|
|
|
|
|
this.readBits = function (size) {
|
|
|
var bits = Math.min(workingBitsAvailable, size),
|
|
|
// :uint
|
|
|
valu = workingWord >>> 32 - bits; // :uint
|
|
|
// if size > 31, handle error
|
|
|
|
|
|
workingBitsAvailable -= bits;
|
|
|
|
|
|
if (workingBitsAvailable > 0) {
|
|
|
workingWord <<= bits;
|
|
|
} else if (workingBytesAvailable > 0) {
|
|
|
this.loadWord();
|
|
|
}
|
|
|
|
|
|
bits = size - bits;
|
|
|
|
|
|
if (bits > 0) {
|
|
|
return valu << bits | this.readBits(bits);
|
|
|
}
|
|
|
|
|
|
return valu;
|
|
|
}; // ():uint
|
|
|
|
|
|
|
|
|
this.skipLeadingZeros = function () {
|
|
|
var leadingZeroCount; // :uint
|
|
|
|
|
|
for (leadingZeroCount = 0; leadingZeroCount < workingBitsAvailable; ++leadingZeroCount) {
|
|
|
if ((workingWord & 0x80000000 >>> leadingZeroCount) !== 0) {
|
|
|
// the first bit of working word is 1
|
|
|
workingWord <<= leadingZeroCount;
|
|
|
workingBitsAvailable -= leadingZeroCount;
|
|
|
return leadingZeroCount;
|
|
|
}
|
|
|
} // we exhausted workingWord and still have not found a 1
|
|
|
|
|
|
|
|
|
this.loadWord();
|
|
|
return leadingZeroCount + this.skipLeadingZeros();
|
|
|
}; // ():void
|
|
|
|
|
|
|
|
|
this.skipUnsignedExpGolomb = function () {
|
|
|
this.skipBits(1 + this.skipLeadingZeros());
|
|
|
}; // ():void
|
|
|
|
|
|
|
|
|
this.skipExpGolomb = function () {
|
|
|
this.skipBits(1 + this.skipLeadingZeros());
|
|
|
}; // ():uint
|
|
|
|
|
|
|
|
|
this.readUnsignedExpGolomb = function () {
|
|
|
var clz = this.skipLeadingZeros(); // :uint
|
|
|
|
|
|
return this.readBits(clz + 1) - 1;
|
|
|
}; // ():int
|
|
|
|
|
|
|
|
|
this.readExpGolomb = function () {
|
|
|
var valu = this.readUnsignedExpGolomb(); // :int
|
|
|
|
|
|
if (0x01 & valu) {
|
|
|
// the number is odd if the low order bit is set
|
|
|
return 1 + valu >>> 1; // add 1 to make it even, and divide by 2
|
|
|
}
|
|
|
|
|
|
return -1 * (valu >>> 1); // divide by two then make it negative
|
|
|
}; // Some convenience functions
|
|
|
// :Boolean
|
|
|
|
|
|
|
|
|
this.readBoolean = function () {
|
|
|
return this.readBits(1) === 1;
|
|
|
}; // ():int
|
|
|
|
|
|
|
|
|
this.readUnsignedByte = function () {
|
|
|
return this.readBits(8);
|
|
|
};
|
|
|
|
|
|
this.loadWord();
|
|
|
};
|
|
|
|
|
|
var expGolomb = ExpGolomb;
|
|
|
|
|
|
var _H264Stream, _NalByteStream;
|
|
|
|
|
|
var PROFILES_WITH_OPTIONAL_SPS_DATA;
|
|
|
/**
|
|
|
* Accepts a NAL unit byte stream and unpacks the embedded NAL units.
|
|
|
*/
|
|
|
|
|
|
_NalByteStream = function NalByteStream() {
|
|
|
var syncPoint = 0,
|
|
|
i,
|
|
|
buffer;
|
|
|
|
|
|
_NalByteStream.prototype.init.call(this);
|
|
|
/*
|
|
|
* Scans a byte stream and triggers a data event with the NAL units found.
|
|
|
* @param {Object} data Event received from H264Stream
|
|
|
* @param {Uint8Array} data.data The h264 byte stream to be scanned
|
|
|
*
|
|
|
* @see H264Stream.push
|
|
|
*/
|
|
|
|
|
|
|
|
|
this.push = function (data) {
|
|
|
var swapBuffer;
|
|
|
|
|
|
if (!buffer) {
|
|
|
buffer = data.data;
|
|
|
} else {
|
|
|
swapBuffer = new Uint8Array(buffer.byteLength + data.data.byteLength);
|
|
|
swapBuffer.set(buffer);
|
|
|
swapBuffer.set(data.data, buffer.byteLength);
|
|
|
buffer = swapBuffer;
|
|
|
}
|
|
|
|
|
|
var len = buffer.byteLength; // Rec. ITU-T H.264, Annex B
|
|
|
// scan for NAL unit boundaries
|
|
|
// a match looks like this:
|
|
|
// 0 0 1 .. NAL .. 0 0 1
|
|
|
// ^ sync point ^ i
|
|
|
// or this:
|
|
|
// 0 0 1 .. NAL .. 0 0 0
|
|
|
// ^ sync point ^ i
|
|
|
// advance the sync point to a NAL start, if necessary
|
|
|
|
|
|
for (; syncPoint < len - 3; syncPoint++) {
|
|
|
if (buffer[syncPoint + 2] === 1) {
|
|
|
// the sync point is properly aligned
|
|
|
i = syncPoint + 5;
|
|
|
break;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
while (i < len) {
|
|
|
// look at the current byte to determine if we've hit the end of
|
|
|
// a NAL unit boundary
|
|
|
switch (buffer[i]) {
|
|
|
case 0:
|
|
|
// skip past non-sync sequences
|
|
|
if (buffer[i - 1] !== 0) {
|
|
|
i += 2;
|
|
|
break;
|
|
|
} else if (buffer[i - 2] !== 0) {
|
|
|
i++;
|
|
|
break;
|
|
|
} // deliver the NAL unit if it isn't empty
|
|
|
|
|
|
|
|
|
if (syncPoint + 3 !== i - 2) {
|
|
|
this.trigger('data', buffer.subarray(syncPoint + 3, i - 2));
|
|
|
} // drop trailing zeroes
|
|
|
|
|
|
|
|
|
do {
|
|
|
i++;
|
|
|
} while (buffer[i] !== 1 && i < len);
|
|
|
|
|
|
syncPoint = i - 2;
|
|
|
i += 3;
|
|
|
break;
|
|
|
|
|
|
case 1:
|
|
|
// skip past non-sync sequences
|
|
|
if (buffer[i - 1] !== 0 || buffer[i - 2] !== 0) {
|
|
|
i += 3;
|
|
|
break;
|
|
|
} // deliver the NAL unit
|
|
|
|
|
|
|
|
|
this.trigger('data', buffer.subarray(syncPoint + 3, i - 2));
|
|
|
syncPoint = i - 2;
|
|
|
i += 3;
|
|
|
break;
|
|
|
|
|
|
default:
|
|
|
// the current byte isn't a one or zero, so it cannot be part
|
|
|
// of a sync sequence
|
|
|
i += 3;
|
|
|
break;
|
|
|
}
|
|
|
} // filter out the NAL units that were delivered
|
|
|
|
|
|
|
|
|
buffer = buffer.subarray(syncPoint);
|
|
|
i -= syncPoint;
|
|
|
syncPoint = 0;
|
|
|
};
|
|
|
|
|
|
this.reset = function () {
|
|
|
buffer = null;
|
|
|
syncPoint = 0;
|
|
|
this.trigger('reset');
|
|
|
};
|
|
|
|
|
|
this.flush = function () {
|
|
|
// deliver the last buffered NAL unit
|
|
|
if (buffer && buffer.byteLength > 3) {
|
|
|
this.trigger('data', buffer.subarray(syncPoint + 3));
|
|
|
} // reset the stream state
|
|
|
|
|
|
|
|
|
buffer = null;
|
|
|
syncPoint = 0;
|
|
|
this.trigger('done');
|
|
|
};
|
|
|
|
|
|
this.endTimeline = function () {
|
|
|
this.flush();
|
|
|
this.trigger('endedtimeline');
|
|
|
};
|
|
|
};
|
|
|
|
|
|
_NalByteStream.prototype = new stream(); // values of profile_idc that indicate additional fields are included in the SPS
|
|
|
// see Recommendation ITU-T H.264 (4/2013),
|
|
|
// 7.3.2.1.1 Sequence parameter set data syntax
|
|
|
|
|
|
PROFILES_WITH_OPTIONAL_SPS_DATA = {
|
|
|
100: true,
|
|
|
110: true,
|
|
|
122: true,
|
|
|
244: true,
|
|
|
44: true,
|
|
|
83: true,
|
|
|
86: true,
|
|
|
118: true,
|
|
|
128: true,
|
|
|
138: true,
|
|
|
139: true,
|
|
|
134: true
|
|
|
};
|
|
|
/**
|
|
|
* Accepts input from a ElementaryStream and produces H.264 NAL unit data
|
|
|
* events.
|
|
|
*/
|
|
|
|
|
|
_H264Stream = function H264Stream() {
|
|
|
var nalByteStream = new _NalByteStream(),
|
|
|
self,
|
|
|
trackId,
|
|
|
currentPts,
|
|
|
currentDts,
|
|
|
discardEmulationPreventionBytes,
|
|
|
readSequenceParameterSet,
|
|
|
skipScalingList;
|
|
|
|
|
|
_H264Stream.prototype.init.call(this);
|
|
|
|
|
|
self = this;
|
|
|
/*
|
|
|
* Pushes a packet from a stream onto the NalByteStream
|
|
|
*
|
|
|
* @param {Object} packet - A packet received from a stream
|
|
|
* @param {Uint8Array} packet.data - The raw bytes of the packet
|
|
|
* @param {Number} packet.dts - Decode timestamp of the packet
|
|
|
* @param {Number} packet.pts - Presentation timestamp of the packet
|
|
|
* @param {Number} packet.trackId - The id of the h264 track this packet came from
|
|
|
* @param {('video'|'audio')} packet.type - The type of packet
|
|
|
*
|
|
|
*/
|
|
|
|
|
|
this.push = function (packet) {
|
|
|
if (packet.type !== 'video') {
|
|
|
return;
|
|
|
}
|
|
|
|
|
|
trackId = packet.trackId;
|
|
|
currentPts = packet.pts;
|
|
|
currentDts = packet.dts;
|
|
|
nalByteStream.push(packet);
|
|
|
};
|
|
|
/*
|
|
|
* Identify NAL unit types and pass on the NALU, trackId, presentation and decode timestamps
|
|
|
* for the NALUs to the next stream component.
|
|
|
* Also, preprocess caption and sequence parameter NALUs.
|
|
|
*
|
|
|
* @param {Uint8Array} data - A NAL unit identified by `NalByteStream.push`
|
|
|
* @see NalByteStream.push
|
|
|
*/
|
|
|
|
|
|
|
|
|
nalByteStream.on('data', function (data) {
|
|
|
var event = {
|
|
|
trackId: trackId,
|
|
|
pts: currentPts,
|
|
|
dts: currentDts,
|
|
|
data: data
|
|
|
};
|
|
|
|
|
|
switch (data[0] & 0x1f) {
|
|
|
case 0x05:
|
|
|
event.nalUnitType = 'slice_layer_without_partitioning_rbsp_idr';
|
|
|
break;
|
|
|
|
|
|
case 0x06:
|
|
|
event.nalUnitType = 'sei_rbsp';
|
|
|
event.escapedRBSP = discardEmulationPreventionBytes(data.subarray(1));
|
|
|
break;
|
|
|
|
|
|
case 0x07:
|
|
|
event.nalUnitType = 'seq_parameter_set_rbsp';
|
|
|
event.escapedRBSP = discardEmulationPreventionBytes(data.subarray(1));
|
|
|
event.config = readSequenceParameterSet(event.escapedRBSP);
|
|
|
break;
|
|
|
|
|
|
case 0x08:
|
|
|
event.nalUnitType = 'pic_parameter_set_rbsp';
|
|
|
break;
|
|
|
|
|
|
case 0x09:
|
|
|
event.nalUnitType = 'access_unit_delimiter_rbsp';
|
|
|
break;
|
|
|
} // This triggers data on the H264Stream
|
|
|
|
|
|
|
|
|
self.trigger('data', event);
|
|
|
});
|
|
|
nalByteStream.on('done', function () {
|
|
|
self.trigger('done');
|
|
|
});
|
|
|
nalByteStream.on('partialdone', function () {
|
|
|
self.trigger('partialdone');
|
|
|
});
|
|
|
nalByteStream.on('reset', function () {
|
|
|
self.trigger('reset');
|
|
|
});
|
|
|
nalByteStream.on('endedtimeline', function () {
|
|
|
self.trigger('endedtimeline');
|
|
|
});
|
|
|
|
|
|
this.flush = function () {
|
|
|
nalByteStream.flush();
|
|
|
};
|
|
|
|
|
|
this.partialFlush = function () {
|
|
|
nalByteStream.partialFlush();
|
|
|
};
|
|
|
|
|
|
this.reset = function () {
|
|
|
nalByteStream.reset();
|
|
|
};
|
|
|
|
|
|
this.endTimeline = function () {
|
|
|
nalByteStream.endTimeline();
|
|
|
};
|
|
|
/**
|
|
|
* Advance the ExpGolomb decoder past a scaling list. The scaling
|
|
|
* list is optionally transmitted as part of a sequence parameter
|
|
|
* set and is not relevant to transmuxing.
|
|
|
* @param count {number} the number of entries in this scaling list
|
|
|
* @param expGolombDecoder {object} an ExpGolomb pointed to the
|
|
|
* start of a scaling list
|
|
|
* @see Recommendation ITU-T H.264, Section 7.3.2.1.1.1
|
|
|
*/
|
|
|
|
|
|
|
|
|
skipScalingList = function skipScalingList(count, expGolombDecoder) {
|
|
|
var lastScale = 8,
|
|
|
nextScale = 8,
|
|
|
j,
|
|
|
deltaScale;
|
|
|
|
|
|
for (j = 0; j < count; j++) {
|
|
|
if (nextScale !== 0) {
|
|
|
deltaScale = expGolombDecoder.readExpGolomb();
|
|
|
nextScale = (lastScale + deltaScale + 256) % 256;
|
|
|
}
|
|
|
|
|
|
lastScale = nextScale === 0 ? lastScale : nextScale;
|
|
|
}
|
|
|
};
|
|
|
/**
|
|
|
* Expunge any "Emulation Prevention" bytes from a "Raw Byte
|
|
|
* Sequence Payload"
|
|
|
* @param data {Uint8Array} the bytes of a RBSP from a NAL
|
|
|
* unit
|
|
|
* @return {Uint8Array} the RBSP without any Emulation
|
|
|
* Prevention Bytes
|
|
|
*/
|
|
|
|
|
|
|
|
|
discardEmulationPreventionBytes = function discardEmulationPreventionBytes(data) {
|
|
|
var length = data.byteLength,
|
|
|
emulationPreventionBytesPositions = [],
|
|
|
i = 1,
|
|
|
newLength,
|
|
|
newData; // Find all `Emulation Prevention Bytes`
|
|
|
|
|
|
while (i < length - 2) {
|
|
|
if (data[i] === 0 && data[i + 1] === 0 && data[i + 2] === 0x03) {
|
|
|
emulationPreventionBytesPositions.push(i + 2);
|
|
|
i += 2;
|
|
|
} else {
|
|
|
i++;
|
|
|
}
|
|
|
} // If no Emulation Prevention Bytes were found just return the original
|
|
|
// array
|
|
|
|
|
|
|
|
|
if (emulationPreventionBytesPositions.length === 0) {
|
|
|
return data;
|
|
|
} // Create a new array to hold the NAL unit data
|
|
|
|
|
|
|
|
|
newLength = length - emulationPreventionBytesPositions.length;
|
|
|
newData = new Uint8Array(newLength);
|
|
|
var sourceIndex = 0;
|
|
|
|
|
|
for (i = 0; i < newLength; sourceIndex++, i++) {
|
|
|
if (sourceIndex === emulationPreventionBytesPositions[0]) {
|
|
|
// Skip this byte
|
|
|
sourceIndex++; // Remove this position index
|
|
|
|
|
|
emulationPreventionBytesPositions.shift();
|
|
|
}
|
|
|
|
|
|
newData[i] = data[sourceIndex];
|
|
|
}
|
|
|
|
|
|
return newData;
|
|
|
};
|
|
|
/**
|
|
|
* Read a sequence parameter set and return some interesting video
|
|
|
* properties. A sequence parameter set is the H264 metadata that
|
|
|
* describes the properties of upcoming video frames.
|
|
|
* @param data {Uint8Array} the bytes of a sequence parameter set
|
|
|
* @return {object} an object with configuration parsed from the
|
|
|
* sequence parameter set, including the dimensions of the
|
|
|
* associated video frames.
|
|
|
*/
|
|
|
|
|
|
|
|
|
readSequenceParameterSet = function readSequenceParameterSet(data) {
|
|
|
var frameCropLeftOffset = 0,
|
|
|
frameCropRightOffset = 0,
|
|
|
frameCropTopOffset = 0,
|
|
|
frameCropBottomOffset = 0,
|
|
|
sarScale = 1,
|
|
|
expGolombDecoder,
|
|
|
profileIdc,
|
|
|
levelIdc,
|
|
|
profileCompatibility,
|
|
|
chromaFormatIdc,
|
|
|
picOrderCntType,
|
|
|
numRefFramesInPicOrderCntCycle,
|
|
|
picWidthInMbsMinus1,
|
|
|
picHeightInMapUnitsMinus1,
|
|
|
frameMbsOnlyFlag,
|
|
|
scalingListCount,
|
|
|
sarRatio,
|
|
|
aspectRatioIdc,
|
|
|
i;
|
|
|
expGolombDecoder = new expGolomb(data);
|
|
|
profileIdc = expGolombDecoder.readUnsignedByte(); // profile_idc
|
|
|
|
|
|
profileCompatibility = expGolombDecoder.readUnsignedByte(); // constraint_set[0-5]_flag
|
|
|
|
|
|
levelIdc = expGolombDecoder.readUnsignedByte(); // level_idc u(8)
|
|
|
|
|
|
expGolombDecoder.skipUnsignedExpGolomb(); // seq_parameter_set_id
|
|
|
// some profiles have more optional data we don't need
|
|
|
|
|
|
if (PROFILES_WITH_OPTIONAL_SPS_DATA[profileIdc]) {
|
|
|
chromaFormatIdc = expGolombDecoder.readUnsignedExpGolomb();
|
|
|
|
|
|
if (chromaFormatIdc === 3) {
|
|
|
expGolombDecoder.skipBits(1); // separate_colour_plane_flag
|
|
|
}
|
|
|
|
|
|
expGolombDecoder.skipUnsignedExpGolomb(); // bit_depth_luma_minus8
|
|
|
|
|
|
expGolombDecoder.skipUnsignedExpGolomb(); // bit_depth_chroma_minus8
|
|
|
|
|
|
expGolombDecoder.skipBits(1); // qpprime_y_zero_transform_bypass_flag
|
|
|
|
|
|
if (expGolombDecoder.readBoolean()) {
|
|
|
// seq_scaling_matrix_present_flag
|
|
|
scalingListCount = chromaFormatIdc !== 3 ? 8 : 12;
|
|
|
|
|
|
for (i = 0; i < scalingListCount; i++) {
|
|
|
if (expGolombDecoder.readBoolean()) {
|
|
|
// seq_scaling_list_present_flag[ i ]
|
|
|
if (i < 6) {
|
|
|
skipScalingList(16, expGolombDecoder);
|
|
|
} else {
|
|
|
skipScalingList(64, expGolombDecoder);
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
expGolombDecoder.skipUnsignedExpGolomb(); // log2_max_frame_num_minus4
|
|
|
|
|
|
picOrderCntType = expGolombDecoder.readUnsignedExpGolomb();
|
|
|
|
|
|
if (picOrderCntType === 0) {
|
|
|
expGolombDecoder.readUnsignedExpGolomb(); // log2_max_pic_order_cnt_lsb_minus4
|
|
|
} else if (picOrderCntType === 1) {
|
|
|
expGolombDecoder.skipBits(1); // delta_pic_order_always_zero_flag
|
|
|
|
|
|
expGolombDecoder.skipExpGolomb(); // offset_for_non_ref_pic
|
|
|
|
|
|
expGolombDecoder.skipExpGolomb(); // offset_for_top_to_bottom_field
|
|
|
|
|
|
numRefFramesInPicOrderCntCycle = expGolombDecoder.readUnsignedExpGolomb();
|
|
|
|
|
|
for (i = 0; i < numRefFramesInPicOrderCntCycle; i++) {
|
|
|
expGolombDecoder.skipExpGolomb(); // offset_for_ref_frame[ i ]
|
|
|
}
|
|
|
}
|
|
|
|
|
|
expGolombDecoder.skipUnsignedExpGolomb(); // max_num_ref_frames
|
|
|
|
|
|
expGolombDecoder.skipBits(1); // gaps_in_frame_num_value_allowed_flag
|
|
|
|
|
|
picWidthInMbsMinus1 = expGolombDecoder.readUnsignedExpGolomb();
|
|
|
picHeightInMapUnitsMinus1 = expGolombDecoder.readUnsignedExpGolomb();
|
|
|
frameMbsOnlyFlag = expGolombDecoder.readBits(1);
|
|
|
|
|
|
if (frameMbsOnlyFlag === 0) {
|
|
|
expGolombDecoder.skipBits(1); // mb_adaptive_frame_field_flag
|
|
|
}
|
|
|
|
|
|
expGolombDecoder.skipBits(1); // direct_8x8_inference_flag
|
|
|
|
|
|
if (expGolombDecoder.readBoolean()) {
|
|
|
// frame_cropping_flag
|
|
|
frameCropLeftOffset = expGolombDecoder.readUnsignedExpGolomb();
|
|
|
frameCropRightOffset = expGolombDecoder.readUnsignedExpGolomb();
|
|
|
frameCropTopOffset = expGolombDecoder.readUnsignedExpGolomb();
|
|
|
frameCropBottomOffset = expGolombDecoder.readUnsignedExpGolomb();
|
|
|
}
|
|
|
|
|
|
if (expGolombDecoder.readBoolean()) {
|
|
|
// vui_parameters_present_flag
|
|
|
if (expGolombDecoder.readBoolean()) {
|
|
|
// aspect_ratio_info_present_flag
|
|
|
aspectRatioIdc = expGolombDecoder.readUnsignedByte();
|
|
|
|
|
|
switch (aspectRatioIdc) {
|
|
|
case 1:
|
|
|
sarRatio = [1, 1];
|
|
|
break;
|
|
|
|
|
|
case 2:
|
|
|
sarRatio = [12, 11];
|
|
|
break;
|
|
|
|
|
|
case 3:
|
|
|
sarRatio = [10, 11];
|
|
|
break;
|
|
|
|
|
|
case 4:
|
|
|
sarRatio = [16, 11];
|
|
|
break;
|
|
|
|
|
|
case 5:
|
|
|
sarRatio = [40, 33];
|
|
|
break;
|
|
|
|
|
|
case 6:
|
|
|
sarRatio = [24, 11];
|
|
|
break;
|
|
|
|
|
|
case 7:
|
|
|
sarRatio = [20, 11];
|
|
|
break;
|
|
|
|
|
|
case 8:
|
|
|
sarRatio = [32, 11];
|
|
|
break;
|
|
|
|
|
|
case 9:
|
|
|
sarRatio = [80, 33];
|
|
|
break;
|
|
|
|
|
|
case 10:
|
|
|
sarRatio = [18, 11];
|
|
|
break;
|
|
|
|
|
|
case 11:
|
|
|
sarRatio = [15, 11];
|
|
|
break;
|
|
|
|
|
|
case 12:
|
|
|
sarRatio = [64, 33];
|
|
|
break;
|
|
|
|
|
|
case 13:
|
|
|
sarRatio = [160, 99];
|
|
|
break;
|
|
|
|
|
|
case 14:
|
|
|
sarRatio = [4, 3];
|
|
|
break;
|
|
|
|
|
|
case 15:
|
|
|
sarRatio = [3, 2];
|
|
|
break;
|
|
|
|
|
|
case 16:
|
|
|
sarRatio = [2, 1];
|
|
|
break;
|
|
|
|
|
|
case 255:
|
|
|
{
|
|
|
sarRatio = [expGolombDecoder.readUnsignedByte() << 8 | expGolombDecoder.readUnsignedByte(), expGolombDecoder.readUnsignedByte() << 8 | expGolombDecoder.readUnsignedByte()];
|
|
|
break;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
if (sarRatio) {
|
|
|
sarScale = sarRatio[0] / sarRatio[1];
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
return {
|
|
|
profileIdc: profileIdc,
|
|
|
levelIdc: levelIdc,
|
|
|
profileCompatibility: profileCompatibility,
|
|
|
width: Math.ceil(((picWidthInMbsMinus1 + 1) * 16 - frameCropLeftOffset * 2 - frameCropRightOffset * 2) * sarScale),
|
|
|
height: (2 - frameMbsOnlyFlag) * (picHeightInMapUnitsMinus1 + 1) * 16 - frameCropTopOffset * 2 - frameCropBottomOffset * 2,
|
|
|
sarRatio: sarRatio
|
|
|
};
|
|
|
};
|
|
|
};
|
|
|
|
|
|
_H264Stream.prototype = new stream();
|
|
|
var h264 = {
|
|
|
H264Stream: _H264Stream,
|
|
|
NalByteStream: _NalByteStream
|
|
|
};
|
|
|
|
|
|
/**
|
|
|
* The final stage of the transmuxer that emits the flv tags
|
|
|
* for audio, video, and metadata. Also tranlates in time and
|
|
|
* outputs caption data and id3 cues.
|
|
|
*/
|
|
|
|
|
|
|
|
|
var CoalesceStream = function CoalesceStream(options) {
|
|
|
// Number of Tracks per output segment
|
|
|
// If greater than 1, we combine multiple
|
|
|
// tracks into a single segment
|
|
|
this.numberOfTracks = 0;
|
|
|
this.metadataStream = options.metadataStream;
|
|
|
this.videoTags = [];
|
|
|
this.audioTags = [];
|
|
|
this.videoTrack = null;
|
|
|
this.audioTrack = null;
|
|
|
this.pendingCaptions = [];
|
|
|
this.pendingMetadata = [];
|
|
|
this.pendingTracks = 0;
|
|
|
this.processedTracks = 0;
|
|
|
CoalesceStream.prototype.init.call(this); // Take output from multiple
|
|
|
|
|
|
this.push = function (output) {
|
|
|
// buffer incoming captions until the associated video segment
|
|
|
// finishes
|
|
|
if (output.text) {
|
|
|
return this.pendingCaptions.push(output);
|
|
|
} // buffer incoming id3 tags until the final flush
|
|
|
|
|
|
|
|
|
if (output.frames) {
|
|
|
return this.pendingMetadata.push(output);
|
|
|
}
|
|
|
|
|
|
if (output.track.type === 'video') {
|
|
|
this.videoTrack = output.track;
|
|
|
this.videoTags = output.tags;
|
|
|
this.pendingTracks++;
|
|
|
}
|
|
|
|
|
|
if (output.track.type === 'audio') {
|
|
|
this.audioTrack = output.track;
|
|
|
this.audioTags = output.tags;
|
|
|
this.pendingTracks++;
|
|
|
}
|
|
|
};
|
|
|
};
|
|
|
|
|
|
CoalesceStream.prototype = new stream();
|
|
|
|
|
|
CoalesceStream.prototype.flush = function (flushSource) {
|
|
|
var id3,
|
|
|
caption,
|
|
|
i,
|
|
|
timelineStartPts,
|
|
|
event = {
|
|
|
tags: {},
|
|
|
captions: [],
|
|
|
captionStreams: {},
|
|
|
metadata: []
|
|
|
};
|
|
|
|
|
|
if (this.pendingTracks < this.numberOfTracks) {
|
|
|
if (flushSource !== 'VideoSegmentStream' && flushSource !== 'AudioSegmentStream') {
|
|
|
// Return because we haven't received a flush from a data-generating
|
|
|
// portion of the segment (meaning that we have only recieved meta-data
|
|
|
// or captions.)
|
|
|
return;
|
|
|
} else if (this.pendingTracks === 0) {
|
|
|
// In the case where we receive a flush without any data having been
|
|
|
// received we consider it an emitted track for the purposes of coalescing
|
|
|
// `done` events.
|
|
|
// We do this for the case where there is an audio and video track in the
|
|
|
// segment but no audio data. (seen in several playlists with alternate
|
|
|
// audio tracks and no audio present in the main TS segments.)
|
|
|
this.processedTracks++;
|
|
|
|
|
|
if (this.processedTracks < this.numberOfTracks) {
|
|
|
return;
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
this.processedTracks += this.pendingTracks;
|
|
|
this.pendingTracks = 0;
|
|
|
|
|
|
if (this.processedTracks < this.numberOfTracks) {
|
|
|
return;
|
|
|
}
|
|
|
|
|
|
if (this.videoTrack) {
|
|
|
timelineStartPts = this.videoTrack.timelineStartInfo.pts;
|
|
|
} else if (this.audioTrack) {
|
|
|
timelineStartPts = this.audioTrack.timelineStartInfo.pts;
|
|
|
}
|
|
|
|
|
|
event.tags.videoTags = this.videoTags;
|
|
|
event.tags.audioTags = this.audioTags; // Translate caption PTS times into second offsets into the
|
|
|
// video timeline for the segment, and add track info
|
|
|
|
|
|
for (i = 0; i < this.pendingCaptions.length; i++) {
|
|
|
caption = this.pendingCaptions[i];
|
|
|
caption.startTime = caption.startPts - timelineStartPts;
|
|
|
caption.startTime /= 90e3;
|
|
|
caption.endTime = caption.endPts - timelineStartPts;
|
|
|
caption.endTime /= 90e3;
|
|
|
event.captionStreams[caption.stream] = true;
|
|
|
event.captions.push(caption);
|
|
|
} // Translate ID3 frame PTS times into second offsets into the
|
|
|
// video timeline for the segment
|
|
|
|
|
|
|
|
|
for (i = 0; i < this.pendingMetadata.length; i++) {
|
|
|
id3 = this.pendingMetadata[i];
|
|
|
id3.cueTime = id3.pts - timelineStartPts;
|
|
|
id3.cueTime /= 90e3;
|
|
|
event.metadata.push(id3);
|
|
|
} // We add this to every single emitted segment even though we only need
|
|
|
// it for the first
|
|
|
|
|
|
|
|
|
event.metadata.dispatchType = this.metadataStream.dispatchType; // Reset stream state
|
|
|
|
|
|
this.videoTrack = null;
|
|
|
this.audioTrack = null;
|
|
|
this.videoTags = [];
|
|
|
this.audioTags = [];
|
|
|
this.pendingCaptions.length = 0;
|
|
|
this.pendingMetadata.length = 0;
|
|
|
this.pendingTracks = 0;
|
|
|
this.processedTracks = 0; // Emit the final segment
|
|
|
|
|
|
this.trigger('data', event);
|
|
|
this.trigger('done');
|
|
|
};
|
|
|
|
|
|
var coalesceStream = CoalesceStream;
|
|
|
|
|
|
/**
|
|
|
* mux.js
|
|
|
*
|
|
|
* Copyright (c) Brightcove
|
|
|
* Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
|
|
|
*/
|
|
|
|
|
|
var TagList = function TagList() {
|
|
|
var self = this;
|
|
|
this.list = [];
|
|
|
|
|
|
this.push = function (tag) {
|
|
|
this.list.push({
|
|
|
bytes: tag.bytes,
|
|
|
dts: tag.dts,
|
|
|
pts: tag.pts,
|
|
|
keyFrame: tag.keyFrame,
|
|
|
metaDataTag: tag.metaDataTag
|
|
|
});
|
|
|
};
|
|
|
|
|
|
Object.defineProperty(this, 'length', {
|
|
|
get: function get() {
|
|
|
return self.list.length;
|
|
|
}
|
|
|
});
|
|
|
};
|
|
|
|
|
|
var tagList = TagList;
|
|
|
|
|
|
var H264Stream = h264.H264Stream;
|
|
|
|
|
|
var _Transmuxer, _VideoSegmentStream, _AudioSegmentStream, collectTimelineInfo, metaDataTag, extraDataTag;
|
|
|
/**
|
|
|
* Store information about the start and end of the tracka and the
|
|
|
* duration for each frame/sample we process in order to calculate
|
|
|
* the baseMediaDecodeTime
|
|
|
*/
|
|
|
|
|
|
|
|
|
collectTimelineInfo = function collectTimelineInfo(track, data) {
|
|
|
if (typeof data.pts === 'number') {
|
|
|
if (track.timelineStartInfo.pts === undefined) {
|
|
|
track.timelineStartInfo.pts = data.pts;
|
|
|
} else {
|
|
|
track.timelineStartInfo.pts = Math.min(track.timelineStartInfo.pts, data.pts);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
if (typeof data.dts === 'number') {
|
|
|
if (track.timelineStartInfo.dts === undefined) {
|
|
|
track.timelineStartInfo.dts = data.dts;
|
|
|
} else {
|
|
|
track.timelineStartInfo.dts = Math.min(track.timelineStartInfo.dts, data.dts);
|
|
|
}
|
|
|
}
|
|
|
};
|
|
|
|
|
|
metaDataTag = function metaDataTag(track, pts) {
|
|
|
var tag = new flvTag(flvTag.METADATA_TAG); // :FlvTag
|
|
|
|
|
|
tag.dts = pts;
|
|
|
tag.pts = pts;
|
|
|
tag.writeMetaDataDouble('videocodecid', 7);
|
|
|
tag.writeMetaDataDouble('width', track.width);
|
|
|
tag.writeMetaDataDouble('height', track.height);
|
|
|
return tag;
|
|
|
};
|
|
|
|
|
|
extraDataTag = function extraDataTag(track, pts) {
|
|
|
var i,
|
|
|
tag = new flvTag(flvTag.VIDEO_TAG, true);
|
|
|
tag.dts = pts;
|
|
|
tag.pts = pts;
|
|
|
tag.writeByte(0x01); // version
|
|
|
|
|
|
tag.writeByte(track.profileIdc); // profile
|
|
|
|
|
|
tag.writeByte(track.profileCompatibility); // compatibility
|
|
|
|
|
|
tag.writeByte(track.levelIdc); // level
|
|
|
|
|
|
tag.writeByte(0xFC | 0x03); // reserved (6 bits), NULA length size - 1 (2 bits)
|
|
|
|
|
|
tag.writeByte(0xE0 | 0x01); // reserved (3 bits), num of SPS (5 bits)
|
|
|
|
|
|
tag.writeShort(track.sps[0].length); // data of SPS
|
|
|
|
|
|
tag.writeBytes(track.sps[0]); // SPS
|
|
|
|
|
|
tag.writeByte(track.pps.length); // num of PPS (will there ever be more that 1 PPS?)
|
|
|
|
|
|
for (i = 0; i < track.pps.length; ++i) {
|
|
|
tag.writeShort(track.pps[i].length); // 2 bytes for length of PPS
|
|
|
|
|
|
tag.writeBytes(track.pps[i]); // data of PPS
|
|
|
}
|
|
|
|
|
|
return tag;
|
|
|
};
|
|
|
/**
|
|
|
* Constructs a single-track, media segment from AAC data
|
|
|
* events. The output of this stream can be fed to flash.
|
|
|
*/
|
|
|
|
|
|
|
|
|
_AudioSegmentStream = function AudioSegmentStream(track) {
|
|
|
var adtsFrames = [],
|
|
|
videoKeyFrames = [],
|
|
|
oldExtraData;
|
|
|
|
|
|
_AudioSegmentStream.prototype.init.call(this);
|
|
|
|
|
|
this.push = function (data) {
|
|
|
collectTimelineInfo(track, data);
|
|
|
|
|
|
if (track) {
|
|
|
track.audioobjecttype = data.audioobjecttype;
|
|
|
track.channelcount = data.channelcount;
|
|
|
track.samplerate = data.samplerate;
|
|
|
track.samplingfrequencyindex = data.samplingfrequencyindex;
|
|
|
track.samplesize = data.samplesize;
|
|
|
track.extraData = track.audioobjecttype << 11 | track.samplingfrequencyindex << 7 | track.channelcount << 3;
|
|
|
}
|
|
|
|
|
|
data.pts = Math.round(data.pts / 90);
|
|
|
data.dts = Math.round(data.dts / 90); // buffer audio data until end() is called
|
|
|
|
|
|
adtsFrames.push(data);
|
|
|
};
|
|
|
|
|
|
this.flush = function () {
|
|
|
var currentFrame,
|
|
|
adtsFrame,
|
|
|
lastMetaPts,
|
|
|
tags = new tagList(); // return early if no audio data has been observed
|
|
|
|
|
|
if (adtsFrames.length === 0) {
|
|
|
this.trigger('done', 'AudioSegmentStream');
|
|
|
return;
|
|
|
}
|
|
|
|
|
|
lastMetaPts = -Infinity;
|
|
|
|
|
|
while (adtsFrames.length) {
|
|
|
currentFrame = adtsFrames.shift(); // write out a metadata frame at every video key frame
|
|
|
|
|
|
if (videoKeyFrames.length && currentFrame.pts >= videoKeyFrames[0]) {
|
|
|
lastMetaPts = videoKeyFrames.shift();
|
|
|
this.writeMetaDataTags(tags, lastMetaPts);
|
|
|
} // also write out metadata tags every 1 second so that the decoder
|
|
|
// is re-initialized quickly after seeking into a different
|
|
|
// audio configuration.
|
|
|
|
|
|
|
|
|
if (track.extraData !== oldExtraData || currentFrame.pts - lastMetaPts >= 1000) {
|
|
|
this.writeMetaDataTags(tags, currentFrame.pts);
|
|
|
oldExtraData = track.extraData;
|
|
|
lastMetaPts = currentFrame.pts;
|
|
|
}
|
|
|
|
|
|
adtsFrame = new flvTag(flvTag.AUDIO_TAG);
|
|
|
adtsFrame.pts = currentFrame.pts;
|
|
|
adtsFrame.dts = currentFrame.dts;
|
|
|
adtsFrame.writeBytes(currentFrame.data);
|
|
|
tags.push(adtsFrame.finalize());
|
|
|
}
|
|
|
|
|
|
videoKeyFrames.length = 0;
|
|
|
oldExtraData = null;
|
|
|
this.trigger('data', {
|
|
|
track: track,
|
|
|
tags: tags.list
|
|
|
});
|
|
|
this.trigger('done', 'AudioSegmentStream');
|
|
|
};
|
|
|
|
|
|
this.writeMetaDataTags = function (tags, pts) {
|
|
|
var adtsFrame;
|
|
|
adtsFrame = new flvTag(flvTag.METADATA_TAG); // For audio, DTS is always the same as PTS. We want to set the DTS
|
|
|
// however so we can compare with video DTS to determine approximate
|
|
|
// packet order
|
|
|
|
|
|
adtsFrame.pts = pts;
|
|
|
adtsFrame.dts = pts; // AAC is always 10
|
|
|
|
|
|
adtsFrame.writeMetaDataDouble('audiocodecid', 10);
|
|
|
adtsFrame.writeMetaDataBoolean('stereo', track.channelcount === 2);
|
|
|
adtsFrame.writeMetaDataDouble('audiosamplerate', track.samplerate); // Is AAC always 16 bit?
|
|
|
|
|
|
adtsFrame.writeMetaDataDouble('audiosamplesize', 16);
|
|
|
tags.push(adtsFrame.finalize());
|
|
|
adtsFrame = new flvTag(flvTag.AUDIO_TAG, true); // For audio, DTS is always the same as PTS. We want to set the DTS
|
|
|
// however so we can compare with video DTS to determine approximate
|
|
|
// packet order
|
|
|
|
|
|
adtsFrame.pts = pts;
|
|
|
adtsFrame.dts = pts;
|
|
|
adtsFrame.view.setUint16(adtsFrame.position, track.extraData);
|
|
|
adtsFrame.position += 2;
|
|
|
adtsFrame.length = Math.max(adtsFrame.length, adtsFrame.position);
|
|
|
tags.push(adtsFrame.finalize());
|
|
|
};
|
|
|
|
|
|
this.onVideoKeyFrame = function (pts) {
|
|
|
videoKeyFrames.push(pts);
|
|
|
};
|
|
|
};
|
|
|
|
|
|
_AudioSegmentStream.prototype = new stream();
|
|
|
/**
|
|
|
* Store FlvTags for the h264 stream
|
|
|
* @param track {object} track metadata configuration
|
|
|
*/
|
|
|
|
|
|
_VideoSegmentStream = function VideoSegmentStream(track) {
|
|
|
var nalUnits = [],
|
|
|
config,
|
|
|
h264Frame;
|
|
|
|
|
|
_VideoSegmentStream.prototype.init.call(this);
|
|
|
|
|
|
this.finishFrame = function (tags, frame) {
|
|
|
if (!frame) {
|
|
|
return;
|
|
|
} // Check if keyframe and the length of tags.
|
|
|
// This makes sure we write metadata on the first frame of a segment.
|
|
|
|
|
|
|
|
|
if (config && track && track.newMetadata && (frame.keyFrame || tags.length === 0)) {
|
|
|
// Push extra data on every IDR frame in case we did a stream change + seek
|
|
|
var metaTag = metaDataTag(config, frame.dts).finalize();
|
|
|
var extraTag = extraDataTag(track, frame.dts).finalize();
|
|
|
metaTag.metaDataTag = extraTag.metaDataTag = true;
|
|
|
tags.push(metaTag);
|
|
|
tags.push(extraTag);
|
|
|
track.newMetadata = false;
|
|
|
this.trigger('keyframe', frame.dts);
|
|
|
}
|
|
|
|
|
|
frame.endNalUnit();
|
|
|
tags.push(frame.finalize());
|
|
|
h264Frame = null;
|
|
|
};
|
|
|
|
|
|
this.push = function (data) {
|
|
|
collectTimelineInfo(track, data);
|
|
|
data.pts = Math.round(data.pts / 90);
|
|
|
data.dts = Math.round(data.dts / 90); // buffer video until flush() is called
|
|
|
|
|
|
nalUnits.push(data);
|
|
|
};
|
|
|
|
|
|
this.flush = function () {
|
|
|
var currentNal,
|
|
|
tags = new tagList(); // Throw away nalUnits at the start of the byte stream until we find
|
|
|
// the first AUD
|
|
|
|
|
|
while (nalUnits.length) {
|
|
|
if (nalUnits[0].nalUnitType === 'access_unit_delimiter_rbsp') {
|
|
|
break;
|
|
|
}
|
|
|
|
|
|
nalUnits.shift();
|
|
|
} // return early if no video data has been observed
|
|
|
|
|
|
|
|
|
if (nalUnits.length === 0) {
|
|
|
this.trigger('done', 'VideoSegmentStream');
|
|
|
return;
|
|
|
}
|
|
|
|
|
|
while (nalUnits.length) {
|
|
|
currentNal = nalUnits.shift(); // record the track config
|
|
|
|
|
|
if (currentNal.nalUnitType === 'seq_parameter_set_rbsp') {
|
|
|
track.newMetadata = true;
|
|
|
config = currentNal.config;
|
|
|
track.width = config.width;
|
|
|
track.height = config.height;
|
|
|
track.sps = [currentNal.data];
|
|
|
track.profileIdc = config.profileIdc;
|
|
|
track.levelIdc = config.levelIdc;
|
|
|
track.profileCompatibility = config.profileCompatibility;
|
|
|
h264Frame.endNalUnit();
|
|
|
} else if (currentNal.nalUnitType === 'pic_parameter_set_rbsp') {
|
|
|
track.newMetadata = true;
|
|
|
track.pps = [currentNal.data];
|
|
|
h264Frame.endNalUnit();
|
|
|
} else if (currentNal.nalUnitType === 'access_unit_delimiter_rbsp') {
|
|
|
if (h264Frame) {
|
|
|
this.finishFrame(tags, h264Frame);
|
|
|
}
|
|
|
|
|
|
h264Frame = new flvTag(flvTag.VIDEO_TAG);
|
|
|
h264Frame.pts = currentNal.pts;
|
|
|
h264Frame.dts = currentNal.dts;
|
|
|
} else {
|
|
|
if (currentNal.nalUnitType === 'slice_layer_without_partitioning_rbsp_idr') {
|
|
|
// the current sample is a key frame
|
|
|
h264Frame.keyFrame = true;
|
|
|
}
|
|
|
|
|
|
h264Frame.endNalUnit();
|
|
|
}
|
|
|
|
|
|
h264Frame.startNalUnit();
|
|
|
h264Frame.writeBytes(currentNal.data);
|
|
|
}
|
|
|
|
|
|
if (h264Frame) {
|
|
|
this.finishFrame(tags, h264Frame);
|
|
|
}
|
|
|
|
|
|
this.trigger('data', {
|
|
|
track: track,
|
|
|
tags: tags.list
|
|
|
}); // Continue with the flush process now
|
|
|
|
|
|
this.trigger('done', 'VideoSegmentStream');
|
|
|
};
|
|
|
};
|
|
|
|
|
|
_VideoSegmentStream.prototype = new stream();
|
|
|
/**
|
|
|
* An object that incrementally transmuxes MPEG2 Trasport Stream
|
|
|
* chunks into an FLV.
|
|
|
*/
|
|
|
|
|
|
_Transmuxer = function Transmuxer(options) {
|
|
|
var self = this,
|
|
|
packetStream,
|
|
|
parseStream,
|
|
|
elementaryStream,
|
|
|
videoTimestampRolloverStream,
|
|
|
audioTimestampRolloverStream,
|
|
|
timedMetadataTimestampRolloverStream,
|
|
|
adtsStream,
|
|
|
h264Stream,
|
|
|
videoSegmentStream,
|
|
|
audioSegmentStream,
|
|
|
captionStream,
|
|
|
coalesceStream$1;
|
|
|
|
|
|
_Transmuxer.prototype.init.call(this);
|
|
|
|
|
|
options = options || {}; // expose the metadata stream
|
|
|
|
|
|
this.metadataStream = new m2ts_1.MetadataStream();
|
|
|
options.metadataStream = this.metadataStream; // set up the parsing pipeline
|
|
|
|
|
|
packetStream = new m2ts_1.TransportPacketStream();
|
|
|
parseStream = new m2ts_1.TransportParseStream();
|
|
|
elementaryStream = new m2ts_1.ElementaryStream();
|
|
|
videoTimestampRolloverStream = new m2ts_1.TimestampRolloverStream('video');
|
|
|
audioTimestampRolloverStream = new m2ts_1.TimestampRolloverStream('audio');
|
|
|
timedMetadataTimestampRolloverStream = new m2ts_1.TimestampRolloverStream('timed-metadata');
|
|
|
adtsStream = new adts();
|
|
|
h264Stream = new H264Stream();
|
|
|
coalesceStream$1 = new coalesceStream(options); // disassemble MPEG2-TS packets into elementary streams
|
|
|
|
|
|
packetStream.pipe(parseStream).pipe(elementaryStream); // !!THIS ORDER IS IMPORTANT!!
|
|
|
// demux the streams
|
|
|
|
|
|
elementaryStream.pipe(videoTimestampRolloverStream).pipe(h264Stream);
|
|
|
elementaryStream.pipe(audioTimestampRolloverStream).pipe(adtsStream);
|
|
|
elementaryStream.pipe(timedMetadataTimestampRolloverStream).pipe(this.metadataStream).pipe(coalesceStream$1); // if CEA-708 parsing is available, hook up a caption stream
|
|
|
|
|
|
captionStream = new m2ts_1.CaptionStream(options);
|
|
|
h264Stream.pipe(captionStream).pipe(coalesceStream$1); // hook up the segment streams once track metadata is delivered
|
|
|
|
|
|
elementaryStream.on('data', function (data) {
|
|
|
var i, videoTrack, audioTrack;
|
|
|
|
|
|
if (data.type === 'metadata') {
|
|
|
i = data.tracks.length; // scan the tracks listed in the metadata
|
|
|
|
|
|
while (i--) {
|
|
|
if (data.tracks[i].type === 'video') {
|
|
|
videoTrack = data.tracks[i];
|
|
|
} else if (data.tracks[i].type === 'audio') {
|
|
|
audioTrack = data.tracks[i];
|
|
|
}
|
|
|
} // hook up the video segment stream to the first track with h264 data
|
|
|
|
|
|
|
|
|
if (videoTrack && !videoSegmentStream) {
|
|
|
coalesceStream$1.numberOfTracks++;
|
|
|
videoSegmentStream = new _VideoSegmentStream(videoTrack); // Set up the final part of the video pipeline
|
|
|
|
|
|
h264Stream.pipe(videoSegmentStream).pipe(coalesceStream$1);
|
|
|
}
|
|
|
|
|
|
if (audioTrack && !audioSegmentStream) {
|
|
|
// hook up the audio segment stream to the first track with aac data
|
|
|
coalesceStream$1.numberOfTracks++;
|
|
|
audioSegmentStream = new _AudioSegmentStream(audioTrack); // Set up the final part of the audio pipeline
|
|
|
|
|
|
adtsStream.pipe(audioSegmentStream).pipe(coalesceStream$1);
|
|
|
|
|
|
if (videoSegmentStream) {
|
|
|
videoSegmentStream.on('keyframe', audioSegmentStream.onVideoKeyFrame);
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
}); // feed incoming data to the front of the parsing pipeline
|
|
|
|
|
|
this.push = function (data) {
|
|
|
packetStream.push(data);
|
|
|
}; // flush any buffered data
|
|
|
|
|
|
|
|
|
this.flush = function () {
|
|
|
// Start at the top of the pipeline and flush all pending work
|
|
|
packetStream.flush();
|
|
|
}; // Caption data has to be reset when seeking outside buffered range
|
|
|
|
|
|
|
|
|
this.resetCaptions = function () {
|
|
|
captionStream.reset();
|
|
|
}; // Re-emit any data coming from the coalesce stream to the outside world
|
|
|
|
|
|
|
|
|
coalesceStream$1.on('data', function (event) {
|
|
|
self.trigger('data', event);
|
|
|
}); // Let the consumer know we have finished flushing the entire pipeline
|
|
|
|
|
|
coalesceStream$1.on('done', function () {
|
|
|
self.trigger('done');
|
|
|
});
|
|
|
};
|
|
|
|
|
|
_Transmuxer.prototype = new stream(); // forward compatibility
|
|
|
|
|
|
var transmuxer = _Transmuxer;
|
|
|
|
|
|
// http://download.macromedia.com/f4v/video_file_format_spec_v10_1.pdf.
|
|
|
// Technically, this function returns the header and a metadata FLV tag
|
|
|
// if duration is greater than zero
|
|
|
// duration in seconds
|
|
|
// @return {object} the bytes of the FLV header as a Uint8Array
|
|
|
|
|
|
|
|
|
var getFlvHeader = function getFlvHeader(duration, audio, video) {
|
|
|
// :ByteArray {
|
|
|
var headBytes = new Uint8Array(3 + 1 + 1 + 4),
|
|
|
head = new DataView(headBytes.buffer),
|
|
|
metadata,
|
|
|
result,
|
|
|
metadataLength; // default arguments
|
|
|
|
|
|
duration = duration || 0;
|
|
|
audio = audio === undefined ? true : audio;
|
|
|
video = video === undefined ? true : video; // signature
|
|
|
|
|
|
head.setUint8(0, 0x46); // 'F'
|
|
|
|
|
|
head.setUint8(1, 0x4c); // 'L'
|
|
|
|
|
|
head.setUint8(2, 0x56); // 'V'
|
|
|
// version
|
|
|
|
|
|
head.setUint8(3, 0x01); // flags
|
|
|
|
|
|
head.setUint8(4, (audio ? 0x04 : 0x00) | (video ? 0x01 : 0x00)); // data offset, should be 9 for FLV v1
|
|
|
|
|
|
head.setUint32(5, headBytes.byteLength); // init the first FLV tag
|
|
|
|
|
|
if (duration <= 0) {
|
|
|
// no duration available so just write the first field of the first
|
|
|
// FLV tag
|
|
|
result = new Uint8Array(headBytes.byteLength + 4);
|
|
|
result.set(headBytes);
|
|
|
result.set([0, 0, 0, 0], headBytes.byteLength);
|
|
|
return result;
|
|
|
} // write out the duration metadata tag
|
|
|
|
|
|
|
|
|
metadata = new flvTag(flvTag.METADATA_TAG);
|
|
|
metadata.pts = metadata.dts = 0;
|
|
|
metadata.writeMetaDataDouble('duration', duration);
|
|
|
metadataLength = metadata.finalize().length;
|
|
|
result = new Uint8Array(headBytes.byteLength + metadataLength);
|
|
|
result.set(headBytes);
|
|
|
result.set(head.byteLength, metadataLength);
|
|
|
return result;
|
|
|
};
|
|
|
|
|
|
var flvHeader = getFlvHeader;
|
|
|
|
|
|
/**
|
|
|
* mux.js
|
|
|
*
|
|
|
* Copyright (c) Brightcove
|
|
|
* Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
|
|
|
*/
|
|
|
|
|
|
var flv = {
|
|
|
tag: flvTag,
|
|
|
Transmuxer: transmuxer,
|
|
|
getFlvHeader: flvHeader
|
|
|
};
|
|
|
|
|
|
return flv;
|
|
|
|
|
|
})));
|
